Adjustable Perpetual Calendar and Date Calculator.
Year: 1898

page_text: Date of Application, 28th Dec., 1898
Complete Specification Left, 28th Sept., 1899-Accepted, 28th Dec., 1899
PROVISIONAL SPECIFICATION.
Adjustable Perpetual Calendar and Date Calculator.
I, SALMON AMOS BUELL, of 3,431, First Avenue, South, City of Minneapolis,
County of Hennepin, State of Minnesota, U.S A., Attorney at Law, do hereby
declare the nature of this invention to be as follows;
1
(f
My invention relates to a perpetual calendar and has for its object to provide an
adjustable perpetual calendar whereby the days of the week and month in any
year from 4999 BC to 3599 AD both "old style" and new style" may be
shown, and whereby all errors that have been made in the caloulations of time
from 4999 B.C to the present ale corrected To this end I have devised a calendar
consisting of two parts relatively adjustable and arranged one upon or in fiont
of the other whereby the days of any year may be determined by the mechanical
manipulation of the parts of the calendar without any resort to independent
calculations
The front of first part is provided with a face or calendar for a common year,
save the days of the week, (and February 29), but in lieu thereof having open-
ings of definite mechanical location with relation to said calendar The second
ar rear part bears mechanically related representations for the days of the week,
for February 29, and for the units and tens of the different years, which repre-
sentations or characters appear in the openings of the first or front part in every
adjustment of the two parts thus completing and correcting the calendar for any
given year, the numbers representing the hundreds and thousands of the years
being also given on the front or first part.
The two relatively adjustable parts of the calendar may be of a rectangular,
circular or other preferred form and may be adjusted by moving one longitudi-
nally over the other, or by arranging both on a common axis or center, thereby
turning one on the other
COMPLETE SPECIFICATION
Adjustable Perpetual Calendar and Date Calculator.
I, SALMON AMOS BUELL, of 3431, First Avenue, S., Minneapolis, Hennepin
County, Minnesota, United States of America, Attorney at Law, do hereby declare
the nature of this invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
This invention relates to calendars, and particularly to perpetual calendars
The object of my invention is to provide an adjustable perpetual calendar where-
гр

page_text: by the days of the week and month in any year may be shown; a further object
is to provide an adjustable calendar that is complete for each and any year to
which it may be adjusted from B.C. 4999 to A.D 3599, and which shows both
the "old style" and "new style" calculations; a further object is to provide an
adjustable calendar containing corrections of all the errors that have been made
in the calculations of time from 4999 B.C. to the present, a further object is to
provide a calendar consisting of two parts relatively adjustable and arranged one
upon the other, the first or front pait having calendar indications and numbers
representing the days of the months for a common year that are progressively
arranged, and other numbers representing the hundreds and thousands of years
within the limits of the calendar that are progressively arranged, and provided
with openings through which characters, figures and numbers on the second
or back part may be shown, and the second or back part having characters repie-
senting the days of the week in duplicate sets that are progressively arranged,
and the figures 2 and 9 for the extra leap-year day (February 29), and numbers
representing the units and tens of all years in any century within the limits of
the calendar, that are progressively arranged, the indications and characters
and figures and numbers on the two parts and the openings on the front part being
so arranged relatively to one another that when the two parts are adjusted so as
to show the number representing any year within the limits of the calendar at
its appropriate opening the calendar will correctly and completely show the days
of the week and the corresponding days of the month for that year
My invention consists generally in an adjustable calendar, whereby the days
of any year may be determined by the mechanical manipulation of the parts of
the calendar and without any resort to independent calculations; my invention
consists further and particularly in a calendar comprising two parts, one upon
or in front of the other, the fiont part provided with a face or calendar for a
rear, save the days of the week and February 29, but in lieu thereof having open-
ings of definite mechanical location with relation to said calendar, and the other
or back part bearing mechanically related representations for the days of the week
and for February 29 and for the units and tens of different years, some of which
representations appear in the openings of the front part in every adjustment of
the back pait to correct and complete the calendar for any given year.
My invention also consists in various constructions and combinations of parts
all as hereinafter described and particularly pointed out in the claims
The invention will be more readily understood by reference to the accompany-
ing drawings, forming part of this specification, and in which;
Fig 1 represents the face and front part of an adjustable calendar embodying
my invention.
Fig 2 is a view thereof with the front part removed. showing a portion of the
back part of the calendar
Fig 3 illustrates the reverse side of the belt partly shown in Fig 2, and the
remaining portion of the back part of the calendar
Fig. 4 is a vertical cross-section of the device
Fig 5 is a detail showing the bearing for the lower roll.
Fig 6 is a similar detail illustrating the adjustable bearing for the upper roll.
Fig. 7 is a sectional detail substantially on the line -r of Fig 6, the roll
being shown in elevation
Fig 8 illustrates the face and front part of a modified form of my calendar.
the same being adapted for the years AD 1 to 2099
Fig 9 is a sectional view on the line y-y of Fig 8
Fig 10 is a cross-section on the line z-z of Fig 8
Fig 11 is a detail of the self-adjusting bearing for the upper roll.
Fig 12 is a section on the line u-u of Fig. 11.
Fig 13 is an end detail.
Fig 14 represents the face of the back and movable part or belt of the calendar
shown in Figs 8 and 9.

page_text: Fig 15 illustrates the face, partly broken away but leaving the front part of
a circular calendar embodying my invention.
Figs. 16 and 17 together represent the face of the circular back and movable
part or disc that is used in connection with the face sheet shown in Fig. 15
Fig. 18 is a cross-section of the back and movable part or disc.
'
Fig. 19 18 a similar cross-section of the complete calendar of the form that
employs the disc shown in Figs 15 to 18.
Figs 20 is a detail of one of the clips used to hold the movable disc.
Figs 21 and 22 together represent the face and front part of an amplified form
of the cucular calendar, whereon the months and hundreds and thousands of
years are divided into separate groups that are progressively arranged.
Fig 23 is an edge view of the same
Figs. 24 and 25 together represent the back and movable part or disc of the
calendar shown in Figs 21 to 23 inclusive.
In devising and constincting a perpetual calendar that shall accomplish the
objects of this invention, there are certain facts in connection with the calcula-
tions of time that must be provided for These I will state biefly as follows.
THE CHRISTIAN ERA,
instituted about Anno Domini 527, dates from the bnth of Jesus Christ, assumed
to have occurred December 25 in the year UC (Uibs Condita-Era of Rome,
dating from the foundation of the city) 753, J.P (Julian Period) 4713,
JE (Julian Ea) 45, and (OL exc-4) (4th year of the 194th Olympiad, and
measures time by numbering the calendar years consecutively, forward and
backward, from that event, counting the calendar year next after that day as
"Anno Domini (in the year of Our Lord) 1," abbreviated "A D. 1", and the
calendar year containing that day, as "Before Christ 1," abbreviated "B.C 1"
The Julian Eta, instituted at Rome by Julius Cæsar, is the source of the Christian
Ea, and the calendar of the latter, as fist instituted, is in length of year and
rule of intercalation (3 common years to 1 intercalary or leap-year) exactly like
the calendar of the former; the year 1 of the Julian Eia being co-incident with
the year BC. 45 of the Christian Era.
THE ERROR YEARS
In the first thu ty-four years of the Julian Eia, by making the year 1 an inter-
calary or leap-year and only two instead of three common years to each
intercalar one, twelve days were enoneously intercalated, instead of nine in thirty-
three years
To correct this error the Roman Emperor directed that no other
intercalary on leap-year should occur until the Julian year 49 (Anno Domini 4)
OLD STYLE AND NEW STYLE
In 1582 Anno Domini, it had been ascertained that the Julian year (adopted
as the Chistian year) was too long, and, in consequence, under the iule of inter-
calation, three common years to one leap-year, the Vernal Equinox in that year
had receded to March 11th from March 21st, the day it occurred in 325 Anno
Domini, the year of the Nicene Council This misplaced the feast of Easter and
all other movable feasts of the church dependent upon its occurrence. To correct
this eno Pope Gregory XIII directed that Fiday, October 5th, should be counted
and become October 15th, thus eliminating ten days, and to prevent the recur-
ience of the e101, he also directed that thereafter a centennial year should not be
a leap-year unless divisible by 400, while prior to that time by the rule of inter-
calation for dates every year divisible by 4 was made a leap-year
"
This change or reformation of the calendar has made two methods of com-
puting time in the Christian Era, the one prior to the change, herein termed
'old style," and the one after, now style." The latter is now used by all
"

page_text: civilized nations except Russia and its dependencies and some other countries
where the Greek Church dominates, which still adhere to "old style
"
For dates Before Chust "old style 18 used by all counties using the Christian
Eia But though the rule of intercalation 18 the same for dates both before and
after Christ, three common years for every leap-year, the application of tho
iule differs in this particular-the first leap-year Anno Domini was the year 4,
hence every year divisible by 4 was a leap-year, but the year 1 Before Christ is
counted as the first leap-year Before Christ, hence the rule of intercalation
Before Christ directs that the year 1 and every year succeeding in numerical order
a year divisible by 4 shall be a leap-year This would make the year 45 Before
Chust a leap-year as it was by the Julian Calendar of which it was the year 1
Between the year 42 Before Christ (Julian year 4) and the year 1 Before Christ,
both inclusive, the "Erior Years" must be used if exactness be iequued in the
computation of time.
"
The calendar which I have devised provides for all of the changes and errors
herein before pointed out, and shows also both "old style" and " 'new style'
calculations.
"
With this preliminary explanation I will now describe the construction, arrange-
ment and mode of operation of my calendar as illustrated in the accompanying
drawings The back part of the calendar theoretically is divided into 252 equal
spaces; by imaginary equidistant horizontal straight lines in that form of the
calendar having a belt for the back part, and by imaginary equidistant adı
from the center of the disc in that form having a disc for the back pait These
spaces are subdivided, in the belt form by imaginary vertical straight lines; and
in the disc form by imaginary cucumferences with different iadi fiom the center
of the disc. In making these subdivisions, the space between any two adjoining
vertical straight lines or circumferences will be suited to the lateral size of the
character or figure to be used. The front part in each form of the calendaı
must be made into like sub-divisions and by the same means respectively, so
that when the parts of the calendar are in proper relative position, the vertical
straight lines in the belt form and the cucumteiences in the disc form upon the
front part will coincide with those upon the back part For convenience I shall
use for "spaces" the words rows of subdivisions If this coincidence of the
vertical straight lines in the belt form and of encumferences in the disc form of
the calendai be continuous during movement of the back part, it follows mechaniı-
cally in the belt form that whenever by such movement a horizontal straight line
upon the back part is passed under a like line on the front part the two straight
lines will coincide, and at the same time every other horizontal straight line on
the front pait will coincide with a like line on the back part; and it results
also in the diso form that whenever by such movement a radius upon the back
part is passed under a radius on the front pait, the two radu will coincide, and
at the same time every ladius upon the font part will comcide with a radius
upon the back pait Therefore, whenever one subdivision on the back part
passes under a subdivision upon the front part there will be a moment when the
boundary lines of the subdivision on the front pait will coincide with the boundary
lines of the one on the back part, and at that moment the boundary lines of
evely subdivision on the front part will coincide with the boundary lines of a
subdivision on the back part Each character or figuie must be placed as near as
may be in the center of its subdivision, leaving sufficient space around it and
within the boundary lines of the subdivision to make the character or figure
clearly and distinctly apparent. This rule when applied to the font part has
some exceptions which will be hereafter noted as they occu
Each opening in
the front part should eliminate the whole of the subdivision within the boundary
lines so that the corresponding subdivision with its occupying character or figuie
upon the back part will appear through the opening as if upon the front part,
and when two figures are to appear at any opening it should eliminate both the
corresponding subdivisions from the front. In construction these subdivision

page_text: boundaries may be drawn in pencil on both parts and should be finally erased from
the back part, though to a certain extent made permanent on the front part.
In all of the figures A represents the front part of the calendar and B the
back part These parts are adjustable relatively to each other, and they may be
of rectangular, circular or other preferred form and may be adjusted by moving
one longitudinally 'over or under the other as shown in Figs 1 to 14 herein
designated the belt form of the calendar, or by arranging both on a common axis
or center and thereby turning one on the other, as shown in Figs 15 to 23, herem
designated the disc form of the calendar In the belt form the two 1olleis L-L
and L-L which carry the belt, have a colla at each end (see Figs. 4 and 7),
which prevent any sidewise motion of the belt. This will secure the necessary
continuity of coincidence of the vertical straight lines upon the front part with
those on the back part And it is self-evident that in the disc form the adjust-
ment and tuining of the back pait upon the common center will secure the neces-
sary continuity of comcidence of the cucumferences upon the front pait with
those of the same iadius upon the back part. The fiont part A has in each
instance punted or marked thereon the names of the months and appropriate
groups of figures or numbers representing the days of each month (except the
29th of February) that are progressively aanged These groups may be
airanged in a single column, as shown in Fig 1, in two columns, as shown
in Fig 8, in a single curved column, on the circular form of calendai, as shown
sn Fig 15, 01 in two curved columns, also in the cuculari form, as shown in
Figs 21 and 22, or in any other preferred number of groups or form of column
of groups
The numbers representing the days of the month are arranged in
horizontal o adial 10ws, seven in each complete or full now, thereby providing
for the seven days of the week and creating seven columns of month-day figures
in each column of groups, and it will be noted that where there are, in any month,
a number of days constituting pait of a week, the first number of the next suc-
ceeding montli 18 allanged in the next succeeding column of month-
day figures and in the low of subdivi8IONS selected for the first 10W
of month-day figures in
the group fol the next succeeding month
In airanging these groups of month-day figures, however, an exception is prefer-
ably made to the rule requiring each character oi figure to be placed in the center
as near as may be of its subdivision The figures in the fist, second, thud, fifth,
sixth and seventh columns of month-day figuies use each three horizontally or
radially adjoining subdivisions, and the figures in the fourth or cente; column use
five such adjoining subdivisions In arranging these groups still another excep-
tion to this same rule is preferably made particularly in the form of the calendai
shown in Fig 21 and 22, and in any other form if desuable on preferable That
is, two or more adjoining houzontal or radial rows of subdivisions may be used
for the month-day figures The number of subdivisions permissible under this
second exception will, however, be limited and governed by the location of the
openings in the front pait for the week-day characters on the back part, as will
be hereinafter explained By the first exception 100m 18 made in the fourth
column of month-day figures for the openings in the front pait for the figures
and 9 on the back pait to complete the month of February on the front pait
in leap-years, and by both exceptions the month-day figures can be made much
laige as they occupy a group of adjoining subdivisions three wide and two o
more high, for in the fourth column of month-day figures this group of sub-
divisions is limited to the three cential ones horizontally or radially in the
column When two figures compose the month-day number they occupy s0
much of their group of subdivisions as possible and still give the number a
clear and distinct appearance, and when but one figure in the month-day number
it occupies a like portion of the night-hand half of its group of subdivisions
For instance, it will be noted that the figure 1, to represent the flist day of
January, 18 placed in the first column of month-day figures.
in the third column and fifth row of month-day figures, The figure 1 to repre-
This bungs the 31

page_text: sent February 1 is then placed in the next succeeding column of month-day
figues and in the low or adjoining 1ows of subdivisions selected for the hist
row of month-day figures in the group for that month, and this system is followed,
it will be noted, though all the forms of the calendar A horizontal on radial
row of seven openings C is provided in the part A, each eliminating therefiom
one subdivision, z, the cential one in the column of month-day figures in
which it is placed; and preferably above every second month In the cucula
form of the calendar these openings are arranged in radial lines instead of hot-
zontal, as shown in Figs. 15, 21 and 22 These openings are aanged above the
group of figures representing every second month for the reason that the same
characters are to appear at each low of openings for the common eais, while
for leap-years the characters that appear at the last five lows of openings are
alike but differ from those that appear at the first row I arrange these open-
ings C so that the distance vertically between the first and second lows of
openings is fourteen lows of subdivisions and between any other two lows of
openings Cthuleen lows of subdivisions This applies to all the forms of the
calendar, except the form shown in Figures 21 to 25 of the diawings, in which
last mentioned form the distance vertically between the first and second rows of
openings C is twenty -81x 10ws of subdivisions and between any other two rows
of openings C twenty-seven 10ws of subdivisions The reason for the increase of
space between the lows of openings C on this form of the calendar is to give
space for making larger month-day figures on the part A It will be noticed
that double space is used on the front part A for the month-day figures, and
that the spaces between the fist and second rows of openings C are one less than
between the others instead of one more, as in the other forms, the reasons for
which will be hereinafter set forth
In the column of month-day figures following February 28, 1 provide two
openings D, each eliminating one subdivision from part A, which permit the
figures 2 and 9 (for February 29) on the back part B of the calendar to be shown
through the front pait A These openings are ananged in the same horizontal
01 radial row as the figures 26, 27 and 28, and the uncut space between the open-
inga is aanged in the same vertical or curved column of subdivisions in which 18
placed the middle opening C in each 10w of such opening- There is a light
modification of the arrangement of the openings in the part A, shown in
Fig. 21
In this, the openings are placed in the upper horizontal or radial 10w
of subdivisions of the two occupied for the last 1ow of month-day figuies in the
group for February
This is because the figures 2 and 9 on the part B occupy
but one subdivision each I also provide in the part A of the complete calenda
foul columns of openings G, H, I, J, which columns are vertical in the belt
form (see Fig 1) and curved in the disc form of the calendar (see Figs 15, 21
and 22) Each of these openings eliminates from the part 1 two subdivisions
houzontally or radially adjoining There is but one opening Garanged at the
foot of the column, having before it the figure 0 (see Figs 1, 15, 22) This 18
used for the years from 1 to 42 Before Christ to correct the e110 herembefore
explained in the Julian Eia. In the next column there are fifty openings H,
having before each one of the numbers 0 to 49 used to represent the hundreds
and thousands as required in the number representing an ear from 1 to 4999
Before Christ These numbers are arranged in order from the bottom to the
top of the column, or run up The openings I are thuty-six in number and have
before them the numbers 0 to 35 These are for the years 1 to 3599 Anno
Domini, old style The openings J have before them the numbers 15 to 35, both
mclusive, and are twenty-one in number, and they are for the years 1582 to 3599
Anno Domini, new style The numbers for the openings I and Jaie in the reverse
order from the numbers for the openings H In the amplified disc form of
calendar shown in Figs 21 to 23 the openings H, I, and J are each placed part
in one and pait in the other of two curved columns on opposite sides of the center.
The openings H preceded by the figures 0 to 27, both inclusive, are upon the

page_text: first day a different but next successive day of the week reading as they are progres-
sively arranged. Therefore between the second row or set of any of the duplicate
sets in one series and the second 10w or set of the duplicate sets of the same
week in the next series, there must be thirteen 1ows of subdivisions, and between
the first row or set of any of the duplicate sets in one series to the second row
or set of the duplicate sets of the same week in the next lower series there must
be fourteen rows of subdivisions.
As has been herein before stated I use on the part A between the first and
second rows of week-day openings C, fourteen rows of subdivisions, and between
any other two rows of week-day openings C thirteen 10ws of subdivisions, excepț
in the disc form of the calendar shown in Figs 21 to 25, both inclusive, in
which form I use on the part A between the fist and second row of week-day open-
ings C twenty-six 10ws of subdivisions, and between any other two rows of week-
day openings C twenty-seven 1ows of subdivisions
For common years the same week must appear in all the 1ows of week-day open-
ings C in the three forms of the calendar shown in Figs. 1 to 20, both inclusive.
Hence for January and February the first set of the duplicate sets of the given
week in the series used will appear in the first row of week-day openings C, and
the second set of the duplicate sets of the same week in the next lower series
will appear in the second 10w of week-day openings C for Maich and April, and
the second set of the duplicate sets of the same week in the next lower series will
appear in the third row of week-day openings C for May and June; and so on,
the second set in each case will appear in the fourth, fifth and sixth rows of week-
day openings C But for leap-years in the same forms of the calendar, the second
set of the duplicate sets of the given week is used for January and February,
hence the first set of the duplicate sets of the next succeeding week in the next
lower series will appear in the second row of week-day openings C for March and
April. This will cause March to commence one day later than in a common year,
and will give room for the 29th day of February which will fall upon the mid-
week day of the week in the second seues exactly like. that week in the first
series which appears for January and February in the first row of openings C.
But as the figures 2 and 9 are found only in the first set of the duplicate sets
the openings D for such figures will each eliminate from the front part A one
qubdivision in the thu teenth row of subdivisions below the first row of openings C
The figures 2 and 9 accompany the week-day character in the fourth column of
week-day characters on the movable part B thus; the 2 18 before and the 9 after
such character, hence the openings D in the part A are separated only by the
subdivision on part A corresponding to the subdivision on part B occupied by
such week-day character, and said character is hidden by said intervening sub-
division on part A. In the disc form of calendar, shown in Figs 21 to 25 the
figures 2 and 9, as before stated, appear only with the column of week-day
characters upon part B used for the left-hand side of part A because February 18
on that side of the calendar, and will each eliminate from pait A
one subdivision in the twenty-second radial IOW of subdivisions below
the first radial row of openings, C. This arrangement on part B of the
week-day characters in series of fourteen, composed of seven duplicate sets of
seven days each that are progressively arranged in the order of the week-days,
both as to the days in each of the duplicate sets and as to the character
commencing each set of the duplicate sets themselves, one character of one
set of the duplicate sets being accompanied by the figures 2 and 9, as heretofore
described This is the basic construction of my calendar, the airangement of the
years upon the movable part B and of the face A of the calendar being built
thereon By reference to the drawings, it will be noticed that in the principal
columns upon the movable part B, the years are arranged for a complete century
and are divided into groups of four, each figure in the fourth number in each
group being separated from the remainder of its own group and from the next
group by an additional subdivision. In explanation of this, which is the second

page_text: important feature of my invention, I may say that in the Christian Era, as
originally instituted, and in which the calculation of time is termed "old style,"
each calendar century consists of seventy-five common years and twenty-five leap-
years, which are separated into twenty-five series of four years each, the first
three years of each series being common years of 365 days, and the fourth a leap-
year containing 366 days. As a common year contains or is made up of fifty-two
weeks and a day, it follows that it begins and ends upon the same day of the week
As the leap-year contains fifty-two weeks and two days, it follows that it com-
mences upon one day of the week and ends upon the next. Therefore, such a
four-years series must commence upon one day of the week and end upon the
fourth succeeding one, or, in other words, five succeeding days of the week are
used for the first and last days of the four years of each four-years' series As
before stated, the two kinds of years, common and leap-years, are represented in
the week-day column upon the movable part B, by the two forms of the same
week distinguished by the figures 2 and 9. One form of week must be used for
a common year, therefore for the next common year it is necessary to skip the
other form of the same week and place each figure used in designating such com-
mon year on a subdivision in the second succeeding horizontal or radial row of
subdivisions occupied by that form of the next week used for a common year.
Thus in each group of three common years the figures will be separated by single
subdivisions Therefore only alternate sets of week-day characters as arranged
upon the calendar are used for common years. Hence, if the year 1 of any century
18 80 placed as to be on a subdivision in the same horizontal or radial row of sub-
divisions with the form of week used for common years, commencing with
the same day of the week as that year, the year 2 will have to be placed on
a subdivision in the second succeeding horizontal or radial row of subdivisions
in order to be opposite a form of week used for common years commencing with
the succeeding day of the week, and the year 3 on a subdivision in the next
succeeding second horizontal or radial row of subdivisions for the same reason; but
as the year 4 is a leap-year and must use the other form of week commencing with
the succeeding day of the week, it must be, advanced one horizontal or radial row
of subdivisions and hence must be placed upon the third succeeding horizontal
or radial row of subdivisions This is because the week-day characters used
for January and February in common years are the same set of
the duplicate sets As the second succeeding horizontal or radial row
of subdivisions contains week-day characters for the week to be used for
January and February of a common year, the third succeeding horizontal or
radial row of subdivisions contains the week-day characters to be used for January
and February of the next succeeding leap-year. As this leap-year ends with the
day of the week next succeeding the one upon which it begins, the two forms of
the week commencing with that day are appropriated in completion of that leap-
year, and the year 5 which commences with the second succeeding day and is the
first year of the second four-years' series, must, therefore, be placed upon the
third horizontal or radial row of subdivisions succeeding the one upon which the
year 4 was placed, because the year 5 18 a common year and must use the same set
in those duplicate sets as had been used before for common years in their respective
duplicate sets Thus it will be seen that for each four-years' series ten rows of
subdivisions have been used, and that the same number must be used for each
of the twenty-five four-years' series in the century This makes two hundred and
fifty rows of subdivisions necessary upon the movable part B for the one hundred
years of any century, but 250 is not a multiple of 14 which is the series of weeks
used, hence 252 the next multiple of 14 18 the number of rows of subdivisions
necessary in order to use this series of week-day characters repeated continuously
upon a belt or disc, the two extra rows of subdivisions being expended between
the "99" and the "00" upon the back part B
In the foregoing. I have referred particularly to the "old style," which will be
more easily understood by reference to the column of years next to the right-hand

page_text: right side of the center and the remainder on the left. The openings I preceded
by the figures 0 to 21 both inclusive, are upon the left side of the center and the
remainder on the light The openings J preceded by the figures 15 to 19, both
inclusive, are upon the left side of the center and the remainder on the right
This arrangement is for convenience and does not affect the operation of the
device The openings G and H are omitted from the modified belt form of
calendar shown in Figs 8 to 14, which is for the period Anno Domini only. In
this form the openings I are arranged in five vertical columns side by side on the
upper and cential portion of the part A. In the four left-hand columns the open-
ings are preceded by the figures 0 to 15, both inclusive, and in the right-hand one
by the figures 1 to 15, both inclusive. The first left-hand column is used for the
years 1 to 28, both inclusive, and the next to the night 18 for the years 29 to 50,
both inclusive, and the next to the night for the years 57 to 81, both inclusive,
and the next to the right for the years 85 to 99, both inclusive, in any
century, and the night-hand column for centennial years, all old style
Anno Domini. The openings J are arranged in five vertical columns side by side
on the lower and cential portion of the part A In the two left-hand columns
the openings are preceded by the figures 16 to 20, both inclusive, and the two
next columns to the night, which extend one opening higher than the pieceding
two columns, by the figures 15 to 20, both inclusive, and the right-hand column
(which does not extend as fai down by one opening as the other columns) by the
figures 16 to 20, both inclusive These five columns are used respectively for the
same years in the century as the columns containing the openings I, but only
for years new style to the year 2100 exclusive, the fist day of new style being
Fiday October 15, 1582. This peculiar arrangement of the openings I and J
18 done to condense this form of the calendar and have it occupy as little space
as possible, and I am enabled to do this because within every century a cycle of
28 years returns January 1 of the 29th year to the same day of the week as
January of the first year of the cycle, that is if in any centu January 1 of the
year 1 falls upon Saturday, then January 1 of the years 20 and 57 and 85 will fall
upon Saturday, and if January 1 of the year 2 falls on Sunday then January 1 of the
years 30 and 58 and 86 will fall upon Sunday and so on through each cycle to and
including the last year of the century By airanging the month-day figures,
together with the accompanying openings C for the week-day characters, in two
columns of six groups each, one column for the months in the first half of the
year on the left side of part A and one column for the months in the last half of
the year on the right side of part A, thus form of the calendar is very much
condensed in area, and as another result the belt pait B need be but 112 sub-
divisions in net length after joining the end
It will be noted that on each form of the calendar the openings H and I for
the years old style both Before Christ and Anno Domini are arranged in regular
succession, the distance between any two openings being one 1ow of subdivisions,
while the openings J for the years new style are arranged as follows. (beginning
for instance with the opening before which appears the number 15) there is one
row of subdivisions between the opening 15 and the opening 16; three rows of
subdivisions between the opening 16 and the opening 17, three rows of sub-
divisions between the opening 17 and the opening 18, three rows of subdivisions
between 18 and 19; one row of subdivisions between 19 and 20, and so on
reason for this is that, as stated before, in the old style computation every fourth
year is a leap-year, while in the new style the leap-years occur in every year that
is divisible by 4 except the centennial years, and in every centennial year that is
divisible by 400
One
Referring now to the back part B of the calendar which may be designated as
the movable part (though the front pait may be made to move while the other
part remains stationary), it will be observed that it must be provided with a
seues of figures or numbers running from 00 to 99, both inclusive, to be shown
at each of the series of openings H, I and J, and with a similar series from 1

page_text: to 42, both inclusive, to be shown at the openings G; with letters or characters
designating the days of the week to be shown at the openings C, and with the
figures 2 to 9 to designate the 29th day of February or extra leap-year day to be
shown, the 2 at the left-hand and the 9 at the right-hand opening D. The
arrangement of the days of the month on the part A of the calendar, as above
explained, divides the months into weeks, January 1st being the first day of its
week. This places February 1st on the fourth day of its week and brings the
29th of February on the fourth day of its week. The figures 2 and 9 must be
placed with the fourth day of the week in the series or column of week-day
characters (which term includes Sunday) upon the movable part B of the calendar,
and these figures appear at openings D for, and only for each leap-year.
In several particulais, now explained, there is preferably a difference between
the amplified disc form of the calendar shown in Figs 21 to 25, both inclusive,
and all the other forms shown in Figs 1 to 20, both inclusive. Because this
amplified disc form has half the months and part of the figures designating the
centuries with their accompanying openings in curved columns on or in each side
of the center of part A, it becomes necessary to duplicate every character and
figure upon part B (except those for the error years and the figures 2 and 9 which
apply only to February on the left side). This is evident for the reason that the
characters and figures on part B to appear at the openings in the left side of
part A would be inverted on the right side, and those to appear at the openings
in the right side would be inverted on the left In order to make this duplication,
the characters and figures and openings upon the left side of part A, are thrown
neare the center than those on the right side by the width of the curved column
of subdivisions used for the names of the months on the left side of part A, and
necessarily the characters and figures upon part B to appear at the openings on
the left side of pait A are placed in eurved columns of subdivisions a like distance
nearer to the center of pait B than those to appear at the openings in the night
side of part A It will be noted also that the characters and figures upon part B
to appear at the openings in the left side of part A are preferably progressively
arranged to read upward except the figures to designate years in a century Before
Christ which are airanged to read downward, and that the characters and figures
upon pait B to appear at the openings in the night side of part A are preferably
piogressively arranged to read downward except the figures to designate years in
a century Before Christ which are arranged to read upward. It will be noted
also in this form (shown in Figs 21 to 25, both inclusive) that preferably the
Figures 2 and 9 on pait B accompany the week-day character for the fourth day
of the week, the 2 being on the left and the 9 on the right in the second set of the
duplicate sets of the week-day characters, and that this set is used for January
and February in the leap-years.
Now referring to the other forms of the calendar shown in Figs 1 to 20, both
inclusive, in regard to the foregoing particulars and it will be noted that there is
no duplication of the characters or figures upon the part B and that preferably
they are progressively arranged to read downward except the figures to designate
the years of a century Before Christ which are arranged to read upward, and
that preferably the figures 2 and 9 so accompany the week-day characters for the
fourth day of the week of the first set of the duplicate sets of week-day characters
and that this set is used for March and subsequent months in leap-years.
These different uses of the set of week-day characters having the figures 2
and 9 therein are governed by the relation of the openings D for the 29th of
February to the openings C for January and February.
The rows or sets of the week-day characters upon the part B of the calendar
read from left to right in the order of the days of the week, and in the same order
are progressively arranged in series of fourteen rows on sets each, the first and
second rows or sets and every succeeding pair of lows or sets being a duplica-
tion of the same week save the use of the figures 2 and 9 therewith, as hereinbefore
explained. Each of the seven week days thus duplicated in each series has for its

page_text: first day a different but next successive day of the week reading as they are progres-
sively arranged Therefore between the second row or set of any of the duplicate
sets in one series and the second row or set of the duplicate sets of the same
week in the next series, there must be thirteen 10ws of subdivisions, and between
the first row or set of any of the duplicate sets in one series to the second row
or set of the duplicate sets of the same week in the next lower series there must
be fourteen rows of subdivisions.
As has been herein before stated I use on the part A between the first and
second rows of week-day openings C, fourteen 1ows of subdivisions, and between
any other two 10ws of week-day openings C thu teen rows of subdivisions, except
in the disc form of the calendar shown in Figs 21 to 25, both inclusive, in
which form I use on the part A between the first and second row of week-day open-
ings C twenty-six rows of subdivisions, and between any other two rows of week-
day openings C twenty-seven rows of subdivisions.
For common years the same week must appear in all the rows of week-day open-
ings C in the three forms of the calendar shown in Figs 1 to 20, both inclusive.
Hence for January and February the first set of the duplicate sets of the given
week in the series used will appear in the first row of week-day openings C, and
the second set of the duplicate sets of the same week in the next lower selles
will appear in the second row of week-day openings C for March and April, and
the second set of the duplicate sets of the same week in the next lower series will
appear in the third row of week-day openings C for May and June, and so on,
the second set in each case will appear in the fourth, fifth and sixth rows of week-
day openings C But for leap-years in the same forms of the calendar, the second
set of the duplicate sets of the given week 18 used for January and February,
hence the first set of the duplicate sets of the next succeeding week in the next
lower series will appear in the second row of week-day openings C for March and
April. This will cause March to commence one day later than in a common year,
and will give 100m for the 29th day of February which will fall upon the mid-
week day of the week in the second series exactly like that week in the first
selles which appears for January and February in the first row of openings C.
But as the figures 2 and 9 are found only in the first set of the duplicate sets
the openings D for such figures will each eliminate from the front part A one
subdivision in the thirteenth row of subdivisions below the first row of openings C.
The figures 2 and 9 accompany the week-day character in the fourth column of
week-day characters on the movable part B thus; the 218 before and the 9 after
such character, hence the openings in the part A are separated only by the
subdivision on part A corresponding to the subdivision on part B occupied by
such week-day character, and said character is hidden by said intervening sub-
division on part A. In the disc form of calendar, shown in Figs. 21 to 25 the
figures 2 and 9, as before stated, appear only with the column of week-day
characters upon part B used for the left-hand side of part A because February 1s
on that side of the calendar, and will each eliminate from part A
one subdivision in the twenty-second radial low of subdivisions below
the first radial row of openings C. This arrangement on part B of the
week-day characters in seiies of fourteen, composed of seven duplicate sets of
seven days each that are progressively arranged in the order of the week-days,
both as to the days in each of the duplicate sets and as to the character
commencing each set of the duplicate sets themselves, one character of one
set of the duplicate sets being accompanied by the figures 2 and 9, as heretofore
described. This is the basic construction of my calendar, the arrangement of the
years upon the movable pait B and of the face A of the calendar being built
thereon By reference to the drawings, it will be noticed that in the principal
columns upon the movable pait B, the years are arranged for a complete century
and are divided into groups of four, each figure in the fourth number in each
group being separated from the remainder of its own group and from the next
group by an additional subdivision. In explanation of this, which is the second

page_text: important feature of my invention, I may say that in the Christian Era, as
originally instituted, and in which the calculation of time is termed "old style,"
each calendar century consists of seventy-five common years and twenty-five leap-
years, which are separated into twenty-five series of four years each, the first
three years of each series being common years of 365 days, and the fourth a leap-
year containing 366 days As a common year contains or 18 made up of fifty-two
weeks and a day, it follows that it begins and ends upon the same day of the week.
As the leap-year contains fifty-two weeks and two days, it follows that it com-
mences upon one day of the week and ends upon the next Therefore, such a
four-years series must commence upon one day of the week and end upon the
fourth succeeding one, or, in other words, five succeeding days of the week are
used for the first and last days of the four years of each four-years' series. As
before stated, the two kinds of years, common and leap-years, are represented in
the week-day column upon the movable part B, by the two forms of the same
week distinguished by the figures 2 and 9. One form of week must be used for
a common year, therefore for the next common year it 18 necessary to skip the
other form of the same week and place each figure used in designating such com-
mon year on a subdivision in the second succeeding horizontal or radial 10w of
subdivisions occupied by that form of the next week used for a common year
Thus in each group of three common years the figures will be separated by single
subdivisions Therefore only alternate sets of week-day characters as arranged
upon the calendar are used for common years Hence, if the year 1 of any century
is so placed as to be on a subdivision in the same horizontal or radial row of sub-
divisions with the form of week used for common years, commencing with
the same day of the week as that year, the year 2 will have to be placed on
a subdivision in the second succeeding horizontal or radial row of subdivisions
in order to be opposite a form of week used for common years commencing with
the succeeding day of the week, and the year 3 on a subdivision in the next
succeeding second horizontal or radial row of subdivisions for the same reason, but
as the year 4 is a leap-year and must use the other form of week commencing with
the succeeding day of the week, it must be, advanced one horizontal or radial row
of subdivisions and hence must be placed upon the thud succeeding horizontal
or radial, row of subdivisions This is because the week-day characters used
for January and February in common years are the same set of
the duplicate sets As the second succeeding horizontal ΟΙ radial row
of subdivisions contains week-day characters for the week to be used for
January and February of a common vear, the third succeeding horizontal or
1adial row of subdivisions contains the week-day characters to be used for January
and February of the next succeeding leap-year As this leap-year ends with the
day of the week next succeeding the one upon which it begins, the two forms of
the week commencing with that day are appropriated in completion of that leap-
year, and the year 5 which commences with the second aucceeding day and is the
first year of the second four-years' series, must, therefore, be placed upon the
third horizontal or radial row of subdivisions succeeding the one upon which the
year 4 was placed, because the year 5 is a common year and must use the same set
in those duplicate sets as had been used before for common years in their respective
duplicate sets Thus it will be seen that for each four-years' series ten rows of
subdivisions have been used, and that the same number must be used for each
of the twenty-five four-years' seines in the century This makes two hundred and
fifty rows of subdivisions necessary upon the movable part B for the one hundred
years of any century; but 250 18 not a multiple of 14 which is the series of weeks
used, hence 252 the next multiple of 14 is the number of rows of subdivisions
necessary in order to use this series of week-day characteis repeated continuously
upon a belt or disc, the two extra rows of subdivisions being expended between
the "99" and the "00" upon the back part B
In the foregoing. I have referred particularly to the "old style," which will be
more easily understood by reference to the column of years next to the right-hand

page_text: This century 18 designated on part A by the figure 0, which is accompanied with
an opening
I in part A. This figure 0 must be placed in such vertical or curved
column (near its beginning) and horizontal or radial row of subdivisions that
the figures 04 in the proper column of figures for years of any century on part B will
appear at the opening in part A at the same time with the week-day character
for Tuesday on part B at the opening C in part A for January 1st, and with the
figures 2 and 9 on part B at the openings D in part A.
This figure must
figure 0 for the
This locates the
This locates the flist century. The second century 18 designated upon part A by
the figure 1, which 18 accompanied with an opening I in part A
be placed in the same column of subdivisions on part A with the
first century, but in the second succeeding row of subdivisions.
second century
Every other succeeding century is located by placing the hundreds-figure used
in designating it upon part A in the same column of subdivisions with the like
figure used in designating the next preceding century, but in the second succeed-
ing row of subdivisions. Of course, as hereinbefore stated, the figure or figures
used in designating a century on pait A must be accompanied with an opening I
on part A
I preferably now take up old style Before Christ, and use for it of the columns
of figures for years in any century on pait B, in the belt-form of the calendar
shown in Figs. 1 to 7, the right-hand column of the two on the left side, and in
the disc-forms of the calendar the next inner column to that one used for old
style Anno Domini
The first year of the first century of this style in order of numbers began with
Thursday and was a leap-year, so by locating this year the century will be located
This century 18 designated on pait A by the figuie 0 which is accompanied
with an opening H in part A This figure 0 must be placed in such vertical oi
curved column (near its ending) and horizontal oi adial row of subdivisions that
the figures 01 in the proper column of figures for years in any century on part B
will appear at the opening Hin part A at the same time with the week-day
character for Thursday on pait B at the opening C on part A for January 1st and
with the figures 2 and 9 on part B at the openings D in pait A for February 29th.
This locates this century.
The second century is designated on part A by the figure 1 which 18 accompanied
with an opening H This figure 1 must be placed in the same column of sub-
divisions with the figure 0 for the first century, but in the second succeeding row
(in numerical order) of subdivisions
This locates the second century
Every other successive century (in numerical order) is located by placing the
hundi eda-figure used in designating it upon part A in the same column of sub-
divisions with the like figure used in designating the next preceding century (in
numerical order) but in the second succeeding row (in numerical order) of sub-
divisions Of course, as herein before shown, the figure or figures used in
designating a century on part A must be accompanied with an opening H on
part A
I preferably now take up new style, and use for it of the columns of figures for
years in any century on part B, in the belt-form of the calendar shown in Figs 1
to 7 the right-hand column, and in the two disc-forms of the calendar the outer
column, and in the modified belt-form of the calendar shown in Figa 8 to 14
the lower portion of part A.
New style began with October 15, 1582, but 1584 was the first leap-year and
began with Sunday
This century is designated upon pait A by the figures 15 which are accompanied
by an opening J in part A These figures 15 must be placed on part A with the
figure 5 in such vertical or curved column (near its beginning or middle) and
horizontal or radial row of subdivisions that the figures 84 in the proper column
of figures for years in any century on part B will appear at the opening J in

page_text: part A at the same time with the week-day character for Sunday on part B at the
opening C in part A for January 1st and with the figures 2 and 9 upon pait B
at the openings D in part A for February 29th. This locates this century
The next succeeding century 18 designated on part A by the figures 16 which
are accompanied by an opening J These figures 16 must be placed upon part A
with the figure 6 in the same column of subdivisions with the figure 6 for the
next preceding century but in the second succeeding row of subdivisions. This
locates this century
The next succeeding century is 'designated on pait A by the figures 17 which
are accompanied by an opening J. These figures 17 must be placed on part A
with the figure 7 in the same column of subdivisions with the figure 6 for the
next pieceding century but in the fourth succeeding low of subdivisions This
locates this century
The next succeeding century is designated upon part A by the figures 18
which are accompanied with an opening J. This century is located with relation
to 17 by exactly the same process used in locating 17 with relation to 16.
The next succeeding century is designated upon part A by the figures 19, which
are accompanied by an opening J and is located with relation to 18 by the same
process used in locating 17 with relation to 16.
All subsequent centuries are located by a similar process, noting that between
the century containing the centennial year and the next succeeding century
there is one row of subdivisions and between any other two centuries there are
three rows of subdivisions, except as hereinafter explained as to the modified form
of calendar shown in Figs 8 to 14 and in the amplified form shown in Figs 21
to 25.
I now take up the Enor Years This fractional century is designated upon
part A by the one figure 0 which is accompanied by an opening (the only one
in the column) G The first leap-year was the year 12 which began with Sunday.
This figure must be placed on part A in such vertical or curved column (near
its ending) and horizontal or radial 1ow of subdivisions that the figures 12 in the
special column of figures for the years on part B will appear at said opening G
in part A at the same time with the week-day character for Sunday on part B at
the opening C in part A for January 1st and with the figures 2 and 9 on pait B
at the openings Don part A for February 9 This locates these erior years It
must be noted finally that in the modified belt-form of calendar shown in Figs. 8
to 14, there is an exception to what has been said in placing the centennial leap-
years, but which is clearly illustrated in Fig. 8, also that in the amplified form
shown in Figs. 21 to 25 there are two initial locations in each of the columns
for old style Anno Domini and for old style Before Christ and for new style
The first of each of these two initial locations have herein before been fully
explained
The second initial location for old style Anno Domini 18 of the century desig-
nated by the figures 22 on the right side of part A, of which the first leap-year will
be the year 2204 and will begin with Monday
The second initial location for old style Before Christ is of the century desig-
nated by figures 28 on the left side of part A, of which the first leap-year was
the year 2801 which began with Thursday.
The second initial location for new style 18 of the century designated by the
figures 20 on the right side of part A of which the first leap-year will be the
year 2204 which will begin with Thursday.
By using the same process for these second initial locations alieady used for
the first ones, these and the remaining centuries (in numerical order) in case of
each style will be properly located.
I do not, however, limit myself to any form of the parts of the calendar or any
particular means for supporting, guiding or adjusting them as the same may be
varied in many particulars without departing from my invention

page_text: This century 18 designated on part A by the figure 0, which 18 accompanied with
an opening I in part A. This figure 0 must be placed in such vertical or curved
column (near its beginning) and horizontal or radial row of subdivisions that
the figures 04 in the proper column of figures for years of any century on part B will
appear at the opening I in part A at the same time with the week-day character
for Tuesday on part B at the opening C in part A for January 1st, and with the
figures 2 and 9 on part B at the openings D in part A
This locates the first century. The second century is designated upon part A by
the figure 1, which is accompanied with an opening I in part A This figure must
be placed in the same column of subdivisions on part A with the figure 0 for the
first century, but in the second succeeding 10w of subdivisions This locates the
second century.
Every other succeeding century is located by placing the hundreds-figure used
in designating it upon pait A in the same column of subdivisions with the like
figure used in designating the next preceding century, but in the second succeed-
ing row of subdivisions Of course, as herein before stated, the figure or figures
used in designating a century on part A must be accompanied with an opening
on part A.
I preferably now take up old style Before Christ, and use for it of the columns
of figures for years in any century on pait B, in the belt-form of the calendar
shown in Figs 1 to 7, the right-hand column of the two on the left side, and in
the disc-forms of the calendar the next inner column to that one used for old
style Anno Domini.
The first year of the first century of this style in order of numbers began with
Thursday and was a leap-year, so by locating this year the century will be located.
This century is designated on pait A by the figure 0 which 18 accompanied
with an opening H in part A This figure 0 must be placed in such vertical oi
curved column (near its ending) and horizontal or radial row of subdivisions that
the figures 01 in the proper column of figuies for years in any century on part B
will appear at the opening H in part A at the same time with the week-day
character for Thursday on part B at the opening C on part A for January 1st and
with the figures 2 and 9 on part B at the openings D in part A for February 29th.
This locates this century
The second century 18 designated on part A by the figure I which is accompanied
with an opening H This figure 1 must be placed in the same column of sub-
divisions with the figure 0 for the first century, but in the second succeeding row
(in numerical order) of subdivisions This locates the second century
Every other successive century (in numerical order) is located by placing the
hundreds-figure used in designating it upon part A in the same column of sub-
divisions with the like figure used in designating the next preceding century (in
numerical order) but in the second succeeding row (in numerical order) of sub-
divisions Of course,
as heieinbefore shown, the figure oi figures used in
designating a century on part A must be accompanied with an opening H on
part A
I preferably now take up new style, and use for it of the columns of figures for
years in any century on part B, in the belt-form of the calendar shown in Figs 1
to 7 the right-hand column, and in the two disc-forms of the calendar the outer
column, and in the modified belt-form of the calendar shown in Figs. 8 to 14
the lower portion of part A.
New style began with October 15, 1582, but 1584 was the first leap-year and
began with Sunday.
This century is designated upon part A by the figures 15 which are accompanied
by an opening J in part A These figures 15 must be placed on part A with the
figure 5 in such vertical or curved column (near its beginning or middle) and
horisontal or radial 10w of subdivisions that the figures 84 in the proper column
of Hgures for years in any century on part B will appear at the opening J in

page_text: part A at the same time with the week-day character for Sunday on part B at the
opening C in part A for January 1st and with the figures 2 and 9 upon part B
at the openings D in part A for February 29th This locates this century.
The next succeeding century is designated on part A by the figures 16 which
are accompanied by an opening J. These figures 16 must be placed upon pait A
with the figure 6 in the same column of subdivisions with the figure 5 for the
next preceding century but in the second succeeding row of subdivisions
locates this century
This
The next succeeding century is designated on pait A by the figures 17 which
are accompanied by an opening J. These figures 17 must be placed on part A
with the figure 7 in the same column of subdivisions with the figure 6 for the
next preceding century but in the fourth succeeding 1ow of subdivisions This
locates this century
The next succeeding century is designated upon pait A by the figures 18
which are accompanied with an opening J This century is located with relation
to 17 by exactly the same process used in locating 17 with relation to 16.
The next succeeding century 18 designated upon pait A by the figures 19, which
are accompanied by an opening J and is located with relation to 18 by the same
process used in locating 17 with relation to 16
All subsequent centuries are located by a similar process, noting that between
the century containing the centennial year and the next succeeding century
there is one row of subdivisions and between any other two centuries there are
three rows of subdivisions, except as hereinafter explained as to the modified form
of calendar shown in Figs 8 to 14 and in the amplified form shown in Figs 21
to 25
I now take up the Error Years. This fractional century is designated upon
part A by the one figure 0 which is accompanied by an opening (the only one
in the column) G The first leap-year was the year 12 which began with Sunday.
This figure 0 must be placed on part A in such vertical or curved column (neal
its ending) and horizontal or radial low of subdivisions that the figures 12 in the
special column of figures for the years on part B will appear at said opening G
in part A at the same time with the week-day character for Sunday on pait Bat
the opening C in part A for January 1st and with the figures 2 and 9 on pait B
at the openings D'on pait A for February 9 This locates these erior years
must be noted finally that in the modified belt-form of calendar shown in Figs 8
to 14, there is an exception to what has been said in placing the centennial leap-
years, but which 18 clearly illustrated in Fig. 8, also that in the amplified form
shown in Figs. 21 to 25 there are two initial locations in each of the columns
for old style Anno Domini and for old style Before Christ and for new style.
The first of each of these two initial locations have herein before been fully
explained
It
The second initial location for old style Anno Domini 18 of the century desig-
nated by the figuies 22 on the right side of part A, of which the first leap-year will
be the year 2204 and will begin with Monday.
The second initial location for old style Before Christ is of the century desig-
nated by figures 28 on the left side of part A, of which the first leap-year was
the year 2801 which began with Thursday
The second initial location for new style 18 of the century designated by the
figures 20 on the night side of part A of which the first leap-year will be the
year 2204 which will begin with Thursday
By using the same precess for these second initial locations already used for
the hist ones, these and the remaining centuries (in numenical order) in case of
each style will be properly located.
I do not, however, limit myself to any form of the parts of the calendar oi any
particular means for supporting, guiding or adjusting them as the same may be
varied in many particulars without departing from my invention

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what'
I claim is:
1. The combination, in a calendar, with a front part provided with groups of
figures representing the days of the months, and with successive rows of week-day
openinga, with seven openings in each row, of a movable back part provided with
characters representing the week-days in duplicate sets or rows that are progres-
sively arranged, and means for guiding the movable part, whereby, as said movable
part is moved the rows of week-day-characters are shown at said week-day openings,
substantially as and for the purpose set forth.
2. The combination, in a calendar, with a front part, provided with groups of
figures representing the days of the months, and with successive rows of openings,
with seven openings in each row, arranged in the described relation to said
groups of figures, of a movable back part provided with duplicate sets or rows of
week-day-characters that are progressively arranged in series, as described, and
means for guiding said movable part, substantially as and for the purpose set forth.
3. The combination, in a calendar, with a front part, provided with groups of
figures representing the days of the months, with successive rows of openings,
with seven openings in each row, alianged as described over the month-day figures,
and provided also with two openings in the same row or in one of the same rows
of subdivisions with and in the column of subdivisions next following the figures
representing February 28, (said last named openings being separated by one sub-
division), of a movable back part provided with duplicate sets or rows of week-day
characters that are progressively arranged and with the figures 2 and 9 arranged
each on the adjoining subdivision on either side of the middle week-day character
in one set of the duplicate sets that are progressively arranged, and means for
guiding the movement of said movable part, substantially as and for the purpose
set forth.
4. The combination, in a calendar, with a front part, provided with groups of
figures representing the days of the months, with successive rows of openings,
having seven openings in each row, arranged over the month-day figures, as
described, and provided also with two openings, in the same 10w, or in one of the
same rows of subdivisions with and in the column of subdivisions next following
the figures representing February 28, (said last named openings being separated
by one subdivision below and in the same column of subdivisions with the middle
opening in the upper row of week-day openings) and provided also with one oi
more columns of openings preceded by figures or characters representing the
hundreds and thousands of years, of a movable part provided with duplicate sets
or rows of week-day characters that are progressively arranged, with seven
characters in each set or row that are progressively arranged in the set or 10w,
with the figures 2 and 9 arranged each in the adjoining subdivision on either
side of the middle week-day character in one set of said duplicate sets that are
progressively arranged, said movable part being also provided with columns of
ngures or characters representing the units and tens of the years, whereby when
Baid movable part 18 adjusted to show, with figuies on the front part, the number
representing any year, whether a common or leap year, the two parts will also
show the days of the week and days of the month for that year, substantially as
described and for the purpose sot forth.
5. The combination, in a calendar, with a front part having century numerals
thereon and openings adjacent thereto, having numerals for the days of the
months and openings adjacent thereto, and separate openings for the figures
representing the 29th day of February, of a movable back part having week-day
characters in duplicate sets that are progressively arranged, so that whenever
week-day characters of one set of the duplicate sets appear through the openings
in the front part corresponding to January and February, week-day characters

page_text: from the other set of the duplicate sets appear in connection with the other
months, said back part having also numerals for indicating the 29th day of
February, and year numerals so arranged that when they indicate the desired year
in connection with the century numerals the calendar 18 set correctly for that
entire year, substantially as described
6. The combination, in a calendar, with a front part provided with groups of
ngures representing the days of the months, and having successive lows of open-
ings C for the week-day characters that with such figures complete the calendar
for each month, and having separate openings for the figures representing the
29th day of February, of a movable back part having week-day characters Fin
duplicate sets that are progressively arranged and also having the figures 2 and 9
arranged upon opposite sides of the middle character of each alternate set of the
duplicate sets, said sets of week-day characters being progressively and con-
tinuously arranged and so related to the openings in the front part that when
the week-day characters of one set of the duplicate sets appear through the openings
in the front part for January and February, characters from the other set of the
duplicate sets will appear in connection with the other months, and, on leap-years
the figures 2 and 9 will apear in the February-29th-openings, said front part also
having year openings, and said back part having numerals arranged in ordei thereon
and so related to the sets of duplicate sets of week-day characters that placing
the figures for any leap-year in said year openings will arrange said week-day
characters in proper relation to the figures representing the days of the months
for that year.
7. A calendai comprising a back part bearing week-day characters in duplicate
sets that are progressively, successively and regularly arranged and said part
also bearing year-hgures successively, but irregularly arranged, according to the
kinds of years, and one set of each of said duplicate sets having the figures 2 and 9,
in combination, with a face part bearing figures representing the days of the
months, and having week-day, 29th-of-February and figured-year perforations 80
arranged that the indication of the year, by the adjustment of the parts, completes
the calendar for that year, whether a leap-year of a common yeai, substantially
as described
8. The combination, in a calendar, with a front pait provided with suitable
openings and calendai indications, of a movable back pait provided with week-
day characters in duplicate sets that are progressively arranged, and said back
part being also provided with the figures 2 and 9 arranged upon opposite sides of a
character of each alternate set, for the purpose set forth.
9. The combination, in a calendar, with a front part provided with calendar
indications, and with means whereby the mdication on the front part and the
characters on the back pait may co-act, of a movable back part provided with
duplicate sets of week-day-characters that are progressively arranged, for the
purpose set forth
10. In a calendar, the combination, with a front part bearing calendar indica-
tions for the several months that are progressively arranged and provided with
means whereby the indications on the front part and the characters on the back
part can co-act, of a back part provided with week-day-characteis in duplicate
Bets that are progressively aanged, so that whenever, for a common year, one
set of a duplicate set co-act with said calendar indications upon the front part
for January and February, the other set of like duplicate sets will co-act with
the calendar indications upon the front part for the other months, substantially
as described
11. In a calendar, the combination, with a front part bearing calendar indica-
tions for the several months that are progressively arranged and provided with
means whereby the indications on the front part and the characters on the back
part can co-act, of a back part provided with week-day-characters in duplicate sets
that are progressively arranged, so that whenever, for a leap-year, one set of a
duplicate set co-acts with the calendar indications upon the front part for January

page_text: and February, the other set of other duplicate sets, that next follow in the order
of said progressive arrangement, (a duplicate set like the duplicate set of which
one set co-acts with the calendar indications upon the front part for January and
February), will co-act with other calendar indications upon the front part for the
other months, substantially as described.
12. In a calendar, the combination, with a front part bearing calendar indica-
tions for the several months that are progressively arranged and provided with means
whereby the indications on the front part and the characters and figures on the
back part can co-act, of a back part bearing week-day-characters in duplicate
sets that are progressively arranged, having a week-day-character in one set of
each duplicate set immediately preceded by the figure 2 and followed by the
figure 9, so that whenever, for a leap-year, one set of a duplicate set co-acta
with the calendar indications upon the front part for January and February,
the figures 2 and 9 in one set of another duplicate set will so co-act with the
calendar indications on the front part for February as to complete such indica-
tions for that month, substantially as described.
13 In a calendar, the combination, with a front part bearing indications for
centuries that are progressively arranged and calendar indications for the several
months that are progressively anlanged and provided with means whereby the
indications on the front part and the indications and characters on the back part
can co-act, of a back pait bearing indications for the years in any century that
are progressively arranged and week-day-characters in duplicate sets that are
progressively arranged, so that whenever, the indications upon the back part fol
any common year in any century co-acts with the indications upon the front part
of any century, thus completing the calendar indications for that common year,
one set of a duplicate set of the week-day-characters upon the back part proper
for January and February of that common year, will co-act with the calendar
indications upon the front pait for such months, and the other set of other like
duplicate sets will co-act with the calendar indications upon the front part for
the other months, substantially as described
14. In a calendar, the combination, with a front part, bearing indications for
centuries that are progressively arranged and calendar indications for the several
months that are progressively arranged and provided with means whereby the
indications on the front part and the indications and characters and figures on the
back part can co-act, of a back part bearing indications for the years in any
century that are progressively arranged, and week-day-characters in duplicate
sets that are progressively arranged, having a week-day-character of one set of
each duplicate set immediately preceded by the figure 2 and followed by the
figure 9, so that whenever, the indications upon the back part for any leap-year
in any century co-act with the indications upon the front part for any century,
thus completing the calendar indications for that leap-year, one set of a duplicate
set of the week-day-characters upon the back part proper for January and February
of that leap-year will co-act with the calendar indications upon the front part
for such months, and the other set of other duplicate sets, that follow next in the
order of said progressive arrangement, (a like duplicate set to the duplicate set
of which one set co-acts with the calendar indications upon the front part for
January and February,) will co-act with the calendar indications upon the front
part for the other months, and the figures 2 and 9 in one set of another duplicate
set will so co-act with the calendar indications on the front part for February as
to complete such indications for that month, thus forming a calendar for that
leap-year, substantially as described.
16. In a calendar, the combination, with a front part bearing calendar indica-
tions for the several months that are progressively arranged and provided with
means whereby the indications on the front part and the indications and
characters and figures on the back part can co-act, of a back part bearing week-
day-characters in duplicate sets that are progressively arranged, so that whenever
one set of a duplicate set co-acts with the calendar indications on the front part

page_text: for January and February, sets of other duplicate sets will co-act with the indica-
tions upon the front part for the other months respectively, one set of each dupli-
cate set including the figures 2 and 9, and said front and back parts respectively
bearing century and year indications co-acting to complete the calendar for
any year, all substantially-as and for the purpose specified.
.
Dated this 28th day of September 1899.
S S BROMHEAD,
Patent Agent, 33, Cannon Street, London.