IMPROVE- MENTS IN AND CONNECTED WITH PERPETUAL CALENDARS
Year: 1882

page_text: LETTERS PATENT to Philip Middleton Justice of 14 Southampton Buildings
in the County of Middlesex-Patent Agent for an Invention of IMPROVE-
MENTS IN AND CONNECTED WITH PERPETUAL CALENDARS A communication
from abroad by Thomas Humphrey Hovenden of Ingersoll Province of Ontario
in the Dominion of Canada
PROVISIONAL SPECIFICATION left by the said Philip Middleton Justice
at the Office of the Commissioners of Patents on the 21st February
1882.
PHILIP MIDDLETON JUSTICE of 14 Southampton Buildings in the County of
Middlesex Patent Agent. "IMPROVEMENTS IN AND CONNECTED WITH PERPETUAL
CALENDARS A communication from abroad by Thomas Humphrey Hovenden
of Ingersoll, Province of Ontario, in the Dominion of Canada
"
This Invention relates to calendars of that class in which the letters and figures
which indicate the month and day of the week or month, are carried on a moving
surface and exposed to view at apertures The objects which I have in view are to
provide an apparatus which shall indicate the day of the week, the month, and the
day of the month, and could be manipulated at will by a single knob to bring into
proper position separately or together either the name or number of the day or the
name of the month, Second to present letters and figures of large size, with a margin
about them of proper extent, within the apertures of the fixed case and at the same
time to keep the apparatus within reasonable limits as to size; Third; to give the
parts positive step by step movement, under control of the operator with yielding
stops between the steps; Fourth, to provide simple moving mechanism for the
apparatus not liable to get out of order; Fifth to arrange a fixed yearly calendar
or series of yearly calendars in convenient connection with the moveable words
and figures indicating days and months; Finally, to produce an effective and
practical calendar within reasonable limits as to cost This Invention consists in
devices and combinations hereinafter more fully explained The box or case in

page_text: which the working parts are contained may be made of any suitable material and
with any suitable kind or amount of ornamentation It consists of top and bottom
pieces, end pieces, a back sliding in grooves and a hinged front composed of a frame
holding a pane of glass, behind which are apertures, in substantially the same
horizontal plane, said apertures being designed to expose the names of the days and
months, and the number of the day, the latter being at the central aperture, with
the months upon the right and the days upon the left This front is hinged
preferably at the bottom and is held at the top by a spring catch but ordinarily it
is not necessary that it should be opened
A shaft has its bearings in end pieces extending through both, and is provided
with knobs at the ends outside the pieces by means of which it may be turned
Other devices may be substituted for the knobs, but they are the simpler and
more convenient Supported upon this shaft is a cylinder provided with heads
having holes centrally therein through which the shaft passes The cylinder is free
to slide upon the shaft, but is made to turn therewith by means of a spline fixed in
the shaft and projecting into a slot in the head This spline is made of wire in the
form of an elongated staple in order to give larger radial extension with lightness,
the horizontal part of the wire spline acting in the slot with less of lost motion in
proportion as it is distant from the centre This gives the desired result without
the necessity for cirse and accurate fit of the parts The cylinder carries spirally
arranged decimal figures on its periphery hereinafter to be described Outside of
this is another cylinder provided with a single head
This cylinder is formed preferably of thin paste board and fits as closely on that
first described as may be consistent with free and easy movement of one upon the
other In order to prevent too much friction a head may be formed at the end of
the cylinders by a narrow strip of paper or pasteboard, the head alone bearing on
the inner cylinder The second cylinder is stationary upon the shaft, being fixed in
position so that the first cylinder as it moves back and forth telescopes within it
numerals from one to zero inclusive, which occupy the unit place of the numbers
representing the day of the month, are arranged in direct line around the periphery
of the second cylinder near the open end thereof These figures therefor arranged
peripherally on the open end of cylinder occupy ten equal spaces.
Upon the first cylinder are arranged another series of figures in ten corre-
sponding longitudinal spaces, each space being occupied by the numerals 1, 2, 3
arranged in the order stated from left to right The columns of these figures
however are arranged spirally upon the cylinder These figures are squarely
arranged in the lines and when the cylinder is in place upon the shaft and is made
to telescope in the second cylinder the lines of figures are in line with those upon
the periphery of said cylinder The relative arrangement of these figures upon the
cylinders is such, that when the inner cylinder is advanced into the outer all the
figures upon the said inner cylinder, are covered and only the figures on the outer
appear at the central aperture in the front of the case It may be assumed that
the first unit in the spiral column of units on the moving cylinder is opposite the
zero in the fixed cylinder Therefore when the moving cylinder is drawn out, the
first unit emerges opposite the zero, and appears in proper place upon its left as
the decimal figure, to represent the number 10 The next unit of the spiral
column appears in the proper order opposite the unit on the fixed cylinder, to
represent 11 and so on down to and including the number 19. There the spiral
colun n of units ends, and the column of twos begins, and as the telescoping
cylinder is further drawn out the figure 2 in the same line as the figure 1 first
exposed, assumes its place to the left of the zero and represents the number 20
The cylinders at this point have made two complete revolutions From the point
where the cylinders present the number 20 at the central aperture, the movement
goes on through the numbers from 20 to 30 in the same way, one tenth revolution
of the cylinder being sufficient to turn the number last exposed completely out of
sight and to bring into place in the aperture the next succeeding number and at
the same time to complete the movement of the decimal figure to the left so as to

page_text: uncover it fully At the end of this revolution the number 30 will be exposed by
the uncovering of the figure 3 first in the spiral column of threes, beginning at the
termination of the spiral column of twos Manifestly there need be but two of the
figures 3 to form the numbers 30 and 31 that being the largest record of days of
any month The requisite spiral direction is given to the first cylinder by means
of a spiral rod which is fixed in a suitable head and encircles the shaft and which
the head of the first cylinder traverses while riding on the shaft. It will bo
apparent that the spiral, being fixed and the cylinder rotated by the shaft through
the spline it is advanced into or retracted from the second cylinder, it being
understood that the said second cylinder revolves with the shaft also The pitch
of the spiral is the same as that of the columns of figures heretofore described,
upon the cylinder The head of the cylinder has an approximately spiral bearing
surface on the shaft and encircles it by one or about one turn. The ends of said
spiral bearing surface saddle the spiral rod and on rotation of the cylinder, traverse
it. One convenient mode of forming this spiral or approximately spiral bearing
surface saddling the spiral rod as explained, consists in making it out of two discs,
each provided with a bearing surface on the shaft for half or about half its
circumference and putting them together in reversed position a path for them to
saddle the spiral being formed at one of the points where the ends meet or
overlap. At the opposite points where the other ends meet they can be bevilled
or cut away if required to allow full clearance for the adjoining turns of the
spiral rod
It is only necessary in setting up these cylinders within the case to arrange
them so that the figure 1 upon the second cylinder will be opposite the central
aperture, while the figures in the left hand spiral column are obscured by movement
such a distance from the edge of the second cylinder that one revolution, which
would bring the zero in front of the central aperture in the fixed case or shell,
would also bring out the first unit of the spiral column into its proper place by the
side of zero
The shell or caso in which is made the central opening is supported on the shaft
by the head heretofore referred to, and by a second head at the other end, both
these heads having ferrules or sleeves attached to them The shaft passes loosely
through these heads and sleeves, and the case or shell is held from turning, and
also slightly elevated from the shaft (to relieve it of the weight, and allow it to
turn more freely) by means of a foot fixed centrally to the shell and resting on an
adjusting screw in a slotted block attached to the bottom of the box the slot in
the block preventing the turning of the cylinder or case It will be understood
that only the central aperture is in this cylindrical shell or case This case is
preferably formed of tin, but obviously any thin material of sufficient strength will
serve the purpose. A plain rectangular plate is placed about the opening and
extends a sufficient distance right and left and upward and downward to form a
part of the face of the central opening in the hinged front The parts heretofore
described it will be observed, serve only to carry and display the numbers indicating
the days of the month, and that these are moved directly by the shaft.
To carry
and display the record of the day of the week and that of the month two other
cylinders are provided of these one carries the day record
It is preferably a paper or paste board cylinder and is carried on a wheel loose
on the sleeve on the head of the case There are two series of week records and
consequently fourteen spaces into which the periphery of the cylinder is divided.
These names of the days of the week are arranged in a column running directly
around the cylinder each name in line parallel with the axis of the cylinder The
two series are used to make the whole number (14) approximate as closely as
possible to the number of spaces or divisions in the month cylinder
The numbers are sufficiently near to render it easy for the day and month
names to be brought opposite the day number, by movement of the numeral
cylinders and shaft The movement of the cylinder carrying the names of the

page_text: days is effected by means of a wheel fixed on the shaft and connected to the
cylinder by means of push and pull pawls of special construction
It may be here stated that these special requirements exist. viz. that the
rotation of the shaft which is the prime mover of all the mechanism shall when
advancing the numeral cylinder, also revolve the "day" cylinder step by step and
more slowly than the shaft and daily number, cylinder for the reason that the
spaces on the former are more in number than those of the latter further, that the
mechanism shall permit the shaft and numoral cylinder to turn freely backward
without turning the day name cylinder.
These special objects are all accomplished by the pawls acting in connection
with annular rows of pins in suitable wheels It will be borne in mind that one
wheel is fixed on the shaft and turns with it like the cylinders carrying the
The fixed
numbers but the cylinder carrying the names of the days is loose
wheel is provided with an annular row of pins ten in number projecting towards
the end of the case These in turn push the first pawl which raises a swinging
rod and this pulls on the second pawl pivoted like the first on the said rod
As the shaft is
The shape of the first pawl is peculiar as well as its location
turned carrying the number cylinder, advancing the numbers in their increasing
order, the second wheel revolving with the shaft, each pin in turn strikes the face
of the offset which is, approximately at right angles to a line drawn from the pivot
through the centre As the pin advances it pushes the pawl upwards and
backward moving first nearly in line and afterwards more and more across that
line, the result of the circular movement of the pin and the straight line movement
of the pawl and rod being that the latter moves a less distance than the former
But the advancing pin rides under the apex of the pawl whose sides meet and the
pawl then falls into the next space between the pins In falling it moves in the
line in which it was raised, the lower end resting on a pin fixed in the end of
the case just above the path of the circular row of pins and the other end being
supported by its pivoting rod In the reverse movement of shaft with its directly
connected cylinders and wheel, the side of the pawl will ride freely over the pins
and no movement of the rod takes place The pull pawl is of ordinary construction
It works on a circular row of pins, fourteen in number set in the head of the day
cylinder and projecting towards fixed wheel, the wheel and head forming a guido
for the pawl and in the same manner the wheel and end of the box form a guide
for the push pawl When the first pawl and rod rise, they move the second pawl
and the day cylinder a single step
It will be borne in mind that to bring a new
number into line, the shaft and first and second cylinders make a tenth revolution,
but to bring a new name into line, only one fourteenth revolution is required of
the day cylinder
As the said cylinder is moved by the shaft which carries positively the number
cylinders a certain amount of motion must be lost in this connecting mechanisın
Some of this is lost by the peculiar construction and arrangement of the pawl
and its connections heretofore described, and some necessarily in the engagement
of the pawl with its pins Further difference of movement and the exact amount of
it is obtained by setting the pins in the head of the day cylinder, in a circle smaller
than those of the wheel A pin is set in the end of the box just above the pawis to
prevent their displacement should the box happen to be turned upside down A rod
has been found a convenient mode of suspending the pawls, said rod resting at one
.end in the slot which guides it and the pawls, and at the other in a staple Other
means however may be devised for connecting, holding, and directing the pawls
Yielding stop mechanism is desirable for all the cylinders That for the numeral
cylinders and the shaft, acts directly upon the before mentioned wheel It consists
of a pawl pivoted on a stud; it carries a small pulley adapted to pass nearly half-
way into the space between the pins on the wheel and to ride over such pins It
is pressed upward by a horizontal arm of a spring and when the shaft is turned
gives it a step by step motion, but it yields enough to permit free continuous
motion The pawl and its pulley may be located partly in a recess in the end of

page_text: the box The upright end of spring is provided with a double bend adapted to fit
between the pins of the disc, holding it by a yielding stop
Small ribs preferably of wire placed around the case, serve as bearings for the
cylinders and lessen the friction The cylinder placed over the end of the case and
carrying the names of the months corresponds in shape and location to the other
cylinder except that it is a trifle longer
But obviously it requires only one movement (or movement one space) each
month, and that is at the beginning of the current number of the days thereof It
will be borne in mind that the day number cylinder turns to expose the numbers
in regular order and is then arrested by a positive stop (hereinafter to be described)
and must then be turned back The construction contemplates the turning back-
ward of this double cylinder until the zero point is brought opposite the aperture
when motion in that direction is arrested The arresting devices may be simple
pins fixed in the end of telescoping cylinder and which bring up, one against a
fixed shoulder on the inside of the head of the case and the other against a
weighted disc hereinafter described
That pin which arrests the advance of the number cylinder, projects into a groove
in a head or disc and brings up against a shoulder at the end thereof, the shoulder
and pin being so arranged that they come into contact when the greatest day
number 31 of any month, is opposite the central aperture If the month on record
be a shorter month, the operator stops at the proper number and from that point
turns back, or if through inadvertence, he advance the cylinder too far, it is easy to
readjust it since he can turn back the number cylinder continuously, and by a back
and forth movement through one or more steps or spaces, he can adjust the week
day cylinder if displaced The pin in the head of the telescoping cylinder advancing
with the backward movement of the cylinder, passes through a head, in like
manner a second pin strikes against a shoulder on a weighted wheel or disc just
inside the head of the case This weighted wheel is loose on a sleeve of the head
of the case and has a further pin projecting through a slot in said head, carrying
a pawl which operates on pins in the inner side of the head of the month cylinder,
said slot being curved, on a radius of which the axis is the centre and is of a
length sufficient to give necessary motion to the pawl The weighted disc has an
offset against which the pin may strike The weight is on the same side with the
offset and preferably in it, and the pawl is so arranged on the weighted wheel,
that the weight when dropping freely, shall throw the pawl to the rear ready for
engagement with the pins of the month cylinder When the number cylinders
therefore are turned back towards zero, the stop pin is brought into contact with
this offset It is so arranged as to strike it when the figure 1 commences to pass
out of sight, and completes the motion when zero is in place, and the movement of
the shaft and number cylinder, necessary to expose the zero, causes the pin in
said number cylinder to turn the weighted disc, and move the pawl and month
cylinder one step forward and then to stop by reason of the pin carrying the pawl
coming against the end of the slot. After that the number cylinders are advanced
by reverse movement through the numbers of the month in proper order without
again moving the month cylinder, since the pin does not strike the disc in its
subsequent revolutions being drawn away by the left hand movement of the
cylinder The pins on the inner side of the month cylinder are twelve in number,
and equidistant and the pawl advances the cylinder one twelfth of its circum-
ference by each action These pins project through the wheel and are acted upon
on the outside by a wire spring pawl, which acts as a yielding stop in like manner
to that of the day of the week cylinder, previously described These last named
yielding stop pawls are made preferably with double inclined projection serving
more accurately to hold the wheel in correct position and centre the indicating
word at the aperture
The arrangement of the weighted disc, adapted to oscillate with its pawl
sufficiently to move the month cylinder one twelfth of a revolution, enables tho
operator to readjust the record whenever it happens to be disarranged

page_text: By repeatedly turning the number cylinder back and forth from one to zero, the
month cylinder can be revolved to any point desired I have found it well to
mount the case on sleeves, One sleeve affords a simple and secure mode of
connecting the weighted disc to the head For this purpose ears are formed on the
inner end of the sleeve bent outward at right angles thereto and fitted to pass
through slots in the weighted disc, there being space left between the ears and the
head to admit the disc and permit it to turn freely on the sleeve The disc is
turned aside and the pawl carrying pin inserted through its proper slot prevents
the ears and their slots from registering with each other
For a more perfect and elaborate grade of machine I modify the stop mechanism
and cause the number cylinders to be arrested at the figure representing the last
day of the particular month This is accomplished by mechanism in the following
manner The head of the cylindrical case is provided with the same form of
weighted disc, pin extending through curved slot in head, and pawl on opposite
side engaging with the twelve pins in annular row on the inner face of the head of
cylinder
The stop pin in this form is a single pin or rod thrust forward by means of the
movement of the telescoping cylinder so that it is caused to project in the same
direction when the cylinder is approaching either end of its movement. This
special construction will be hereinafter more fully described The rod thus
projecting at both extremes will at one extreme strike on one side of a
projection on the weighted disc and then at the other extreme on the other
side
The slot in the head of the case is about three times the length of that in the
form first described and the weighted disc has three times the possible movement
It will be borne in mind that the number cylinders have an upward surface
movement in front when changing the daily record in it's advancing order and
therefore the rod when projected at the last of the month will strike the upper or
rear side of the projection on the weighted disc The disc therefore is held to
three various positions, corresponding to the three different lengths of months.
When held with the offsets farthest to the rear, or in such position that the rod
will strike earlier, the number cylinder is arrested when the number 29 is displayed
(that being the maximum of February, and no note being taken of its variations)
when in a second position less removed to the rear, the cylinder is stopped when
the figure 30 is displayed and the last position of the weighted disc permits
movement of the numeral cylinder to the number 31. This adjustment is
accomplished by means of a latch on the side of the case head, opposite the
weighted disc
'
This latch is pivoted at the end of a curved slot similar to the upper slot in
said head, in which moves a pin set in the face of the weighted disc This slot is
on the lower side of the head, and the latch drops by gravity
The latch has three equidistant shoulders or steps and when it is at its lowest
limit, the step arrests the pin and thereby the weighted disc with its offset in
position to stop the cylinder when the figure 29 is displayed. Raised a little
higher the latch lets the pin pass to the second step, and when held higher still, to
the last step, stopping the cylinder at 30 and 31 respectively The position of the
latch is regulated by means of an arm attached thereto and made to permit it to
ride over the pins which project inwardly on the month cylinder head. There are
three rows of pins thus projecting on this head.
The inner row, twelve in number are to operate in connection with the pawl, and
are the same as the pins in the other form The two outer rows act on the arm of
the latch In order that the pawl may not act on more than one pin at a time,
I have arranged a shield over the pawl pins, so that the pawl for the second or
third space rests on the shield, and cannot act on more than one of the pins.
bent pin prevents too great outward movement of the pawl, preventing it from
becoming entangled with the outer rows of pins should the box be upset The
devices for giving motion to the before mentioned rod consist of the main shaft
A

page_text: Screw
upon which is pivoted a lever to which is attached the said rod, said rod being
supported in the eye of a guide pin The rod passes with a large clearance through
the head of the first cylinder, and with a close guiding fit, through the head of the
second cylinder. A spring holds the lever normally with rod retracted
pins are adjusted on the cylinder heads, as to length, and are arranged to strike
opposite ends of the lever. Thus whether the cylinder be moved to left or right,
one of the pins when the cylinder approaches the end of its movement, will strike
the lever and push out the rod. The movement due to the spiral is gradual and
the rod and offset on the weighted disc must be adjusted to each other and to the
head so that the rod will have bearing on the offset at its first impact, and not
bind against the head in the latter part of its movement To prevent this binding
the head is cut away, or reduced in thickness at the required point.
The rear limit in this system of stops is the same as in the other form
The rod on the backward motion of the cylinder, strikes against the front side
of the offset on the weighted wheel and the pin then brings up against the end of
the slot in the head, having moved the next month record into place as the zero
figure comes opposite the aperture On the front of the apparatus I arrange in
special and convenient relation to the moving record a fixed calendar This is
printed on two strips of paper, the upper having the first and the lower the latter
half of the year, the year being preferably in central position in each
They are set in a light frame, supporting an opaque front, in which the horizon-
tally arranged apertures are made This light frame is set removably into the
hinged frame, which carries the glass I use a series of these calendar strips, one
placed underneath the other in proper order, so that one may be removed when out
of date An advantage arises from dividing the year into periods of six months on
the slips, since the upper slip of one year may be removed before that year has
expired, leaving the first six months of the next year exposed, so that in the last
part of the year, the record of the next ensuing year may be partly visible
Records for any number of years desired may be placed one underneath another
I have attached them by the edge next the frame, so that they may be turned up,
and the calendar for any future year examined The old calendars may be folded
when removed from their connections and held by a clip and placed in the bottom
of the box underneath the cylinders The operation of the apparatus has
been explained with sufficient fullness in connection with the description of the
parts
It may be necessary only to add that the record when disarranged may be
brought into proper order by first turning back the shaft and number cylinder to
zero, when by oscillation from 0 to 1 the proper month may be represented at the
aperture Afterward the shaft is turned forward to the proper number and the name
of the day required may be brought into place as heretofore explained As a
modification of the yielding stop mechanism, instead of the pawl carrying the
friction roller and pressed upward by the spring bearing on a pin on the pawl, I
use the spring itself as a pawl, by extending it a sufficient distance, and forming a
double incline or obtuse angular bend which fits in the space between the pins in
the same manner as the wheel before described
This construction has the merit of greator simplicity I have found that the
ferrules or sleeves attached to the heads of the case, on which the heads, of the
month, and day of the week cylinders, run, may be dispensed with and these heads
as well as all the heads and wheels may have their bearings directly upon the
shaft In this plan the case is held in correct position on the shaft by a pin
inserted in the shaft just outside the head, thus preventing any crowding or
binding of the weighted disc between the head and the enlarged part of the shaft
Other pins can also be inserted in the shaft to keep the month and day of the
week cylinders in position.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Philip Middleton Justice in the Great Seal Patent Office on the
15th August 1882.
PHILIP MIDDLETON JUSTICE of 14 Southampton Buildings, in the County of
Middlesex Patent Agent IMPROVEMENTS IN AND CONNECTED WITH PERPETUAL
CALENDARS. A communication from abroad by Thomas Humphrey Hovenden
of Ingersoll, Province of Ontario in the Dominion of Canada
This Invention relates to calendars of that class in which the letters and figures
which indicate the month, and day of the week or month are carried on a moving
surface and exposed to view at apertures The objects in view are to provide an
apparatus which shall indicate the day of the week, the month and the day of the
month, and which can be manipulated at will by a single knob, to bring into
proper position separately or together, either the name or number of the day or the
name of the month-second, to present letters and figures of large size, with a
margin about them of proper extent, within the apertures of the fixed case, and at
the same time to keep the apparatus within reasonable limits as to size, third to
give the parts positive step by step movement under control of the operator, with
yielding stops between the steps, fourth to provide simple moving mechanism
for the apparatus not liable to get out of order fifth, to arrange a fixed yearly
calendar or series of yearly calendars in convenient connection with the moveable
words and figures indicating days and months; finally, to produce an effective and
practical calendar within reasonable limits as to cost This Invention consists in
devices and combinations hereinafter more fully explained and particularly
indicated in the claims Hereinafter I have fully described and in the accom-
panying Drawings illustrated, what I consider the best means for carrying my
Invention into practical effect In the Drawings Fig. 1 represents a front elevation
of the calendar; Fig. 2 a front elevation with the front of the case lowered Fig. 3
is a central vertical longitudinal section; Fig. 4 a cross section on line 4.-4; Fig. 5 a
cross section on line 5. 5; Fig. 6 a cross section on line 6. 6; Fig. 7 a section on
line 7. 7; Fig. 8 a section on line 8. 8; Fig. 9 a section on line 9. 9; and Fig. 10
a section on line 10, 10 of Figure 3. These cross sections are all views looking
to the left; Fig. 11 represents the two numeral cylinders upon the shaft ; Fig. 12.
represents a side elevation of a modification the heads and discs being shown with
the coverings in section; Fig. 13 represents opposite sides of the head of the
month cylinder shown in Fig 12 Fig 14 is another view of a modification;
Fig 15 illustrates the method of forming the spiral path in the head of the
cylinder 2; Fig 16 is a modification of some of the parts shown in Figure 5-In
these Drawings the box or case in which the working parts are contained is shown
at A. This case may be made of any suitable material, and with any suitable kind
or amount of ornamentation It consists of top and bottom pieces a, a, end
pieces b, b; a back sliding in grooves, and a hinged front c composed of a frame
holding a pane of glass; behind which are apertures d, e, f in substantially, the
same horizontal plane said apertures being designed to expose the names of the
days and months, and the number of the day the latter being at the central
aperture, with the months upon the right and the days upon the left This front
is hinged preferably at the bottom, and is held at the top by a spring catch but
ordinarily it is not necessary that it should be opened
A shaft 1 has its bearings in the end pieces b, b, extending through both and is
provided with knobs at the ends outside the pieces by means of which it may be
turned. Other devices may be substituted for the knobs but they are the simpler

page_text: This
and more convenient. Supported upon this shaft is a cylinder 2 provided with
heads 3, 4, having holes centrally therein through which the shaft passes. The
cylinder 2 is free to slide upon the shaft, but is made to turn therewith by means
of a spline 5 fixed in the shaft and projecting into a slot in the head 4 This
spline is made of wire in the form of an elongated staple in order to give larger
radial extension with lightness, the horizontal part of the wire spline acting in the
slot with less of lost motion in proportion as it is distant from the centre
gives the desired result without the necessity for close and accurate fit of the parts.
The cylinder 2 carries spirally arranged decimal figures on its periphery, hereafter
to be described Outside this is another cylinder 6 provided with a single head 7
This cylinder is formed preferably of thin pasteboard and fits as closely on that
first described as may be consistent with free and easy movement of one upon the
other In order to prevent too much friction, a bead may be formed at the end of
the cylinders by a narrow strip of paper or pasteboard, the bead alone bearing on
the inner cylinder The cylinder 6 is stationary upon the shaft being fixed in the
position shown in Fig. 3 so that the cylinder 2 as it moves back and forth,
telescopes within it Numerals from one to zero inclusive which occupy the unit
place of the numbers representing the day of the month are arranged in direct
Îine around the periphery of cylinder 6, near the open end thereof These figures
therefore arranged peripherally on the open end of cylinder 6 occupy ten equal
spaces. Upon cylinder 2 are arranged another series of figures, in ten corresponding
longitudinal spaces, each spare being occupied by the numerals 1, 2, 3 arranged in
the order stated from left to right The columns of these figures however are arranged
spirally upon the cylinder as shown in Fig. 11 These figures are squarely arranged
in the lines and when the cylinder is in place upon the shaft and is made to
telescope in cylinder 6, the lines of figures upon cylinder 2 are in line with those
upon the periphery of cylinder 6 The relative arrangement of these figures upon
the cylinders is such that when the inner cylinder is advanced into the outer,
all the figures upon the said inner cylinder are covered, and only the figures
on the outer appear at the central aperture in the front of the caso
It will be observed by reference to Figure 11 that the first unit in the spiral
column of units in the moving cylinder is opposite the zero in the fixed cylinder,
therefore when the moving cylinder is drawn out the first unit emerges opposite
the zero and appears in proper place upon its left as the decimal figure to represent
the number 10 The next unit of the spiral column appears in the proper order
opposite the unit on the fixed cylinder to represent 11 and so on down to and
including the number 19 There the spiral column of units ends, and the column
of twos begins and as the telescoping cylinder is further drawn out, the figure 2 in
the same liue as the figure 1 first exposed assumes its place to the left of the zero
and represents the number 20 The cylinders at this point have made two complete
revolutions From the point where the cylinders present the number 20 at the
central aperture the movement goes on through the numbers from 20 to 30 in the
same way one tenth revolution of the cylinder in the direction of the arrows
Figs 45 & 11 being sufficient to turn the number last exposed completely out of
sight, and to bring into place in the aperture the next succeeding number and at
the same time to complete the movement of the decimal figure to the left so as to
uncover it fully from the cylinder 6 At the end of this revolution the number 30
will be exposed by the uncovering of the figure 3, first in the spiral column of
threes, beginning at the termination of the spiral column of twos Manifestly there
need be but two of the figures 3 to form the numbers 30 and 31 these being the
largest record of days of any month The requisite spiral direction is given to the
cylinder 2 by means of a spiral rod 8 which is fixed in the head 9 and encircles the
shaft, as shown in Figure 3 and which the head 3 of the first cylinder traverses
while riding on the shaft. It will be apparent that the spiral being fixed and the
cylinder 2 rotated by the shaft through the spline 5, it is advanced into or retracted
from the cylinder 6, it being understood that the said cylinder û revolves with the
shaft also The pitch of the spiral 8 is the same as that of the columns of figures

page_text: heretofore described upon the cylinder 2 The head 3 of cylinder 2 has an
approximately spiral bearing surface on the shaft and encircles it by one or about
one turn The ends of said spiral bearing surface saddle the spiral rod and on
rotation of the cylinder traverse it One convenient mode of forming this spiral
or approximately spiral bearing surface saddling the spiral rod as explained is
shown in Fig 15 and consists in making it out of two discs each provided with a
bearing surface on the shaft for half or about half its circumference and putting
them together in reversed position, a path for them to saddle the spiral being forined
at one of the points where the ends meet or overlap At the opposite points where
the other ends meet they can be bevelled or cut away if required to allow full
clearance for the adjoining turns of the spiral rod It is only necessary in setting
up these cylinders within the case to arrange them so that the figure I upon the
cylinder 6 will be opposite the central aperture while the figures in the left hand
spiral column are obscured by movement such a distance from the edge of the
cylinder 6 that one evolution which would bring the zero in front of the central
aperture in the fixed case or shell 10 would also bring out the first unit of the
spiral column into its proper place by the side of zero The shell or caso in which
is made the central opening is shown at 10 It is supported on the shaft by the
head 9 heretofore referred to and by a second head 11 at the other end, both these
heads having ferrules or sleeves 75, 76 attached to them as shown in Figs 3 and 11
The shaft passes loosely through these heads and sleeves and the case or shell is
held from turning and also slightly elevated from the shaft (to relieve it of the
weight and allow it to turn more freely) by means of a foot 12 Fig 3 fixed centrally
to the shell and resting on an adjusting screw in a slotted block attached to the
bottom of the box, the slot in the block preventing the turning of the cylinder or
case
It will be understood that only the central aperture is in this cylindrical shell
or case 10. This case is preferably formed of tin, but obviously any thin material
of sufficient strength will serve the purpose A plain rectangular plate is placed
about the opening and extends a sufficient distance right and left and upward and
downward to form a part of the face of the central opening in the hinged front
shown in Fig. 2. The parts heretofore described it will be observed serve only to
carry and display the numbers indicating the days of the month, and that these
are moved directly by the shaft To carry and display the record of the day of
the week and that of the month, two other cylinders are provided Of these, that
marked 13 carries the day record It is preferably a paper or paste board cylinder
and is carried on a wheel 15 loose on the sleeve 75 on the head of the case 10
There are two series of week records and consequently fourteen spaces into which
the periphery of the cylinder is divided These nanes of the days of the week
are arranged in a column running directly around the cylinder, each name in line
parallel with the axis of the cylinder The two series are used to make the whole
number (14) approximate as closely as possible to the number of spaces or divisions
in the month cylinder The numbers are sufficiently near to render it easy for
the day and mouth names to be brought opposite the day numbers by movement
of the numeral cylinders and shaft The movement of the cylinder 13 carrying the
names of the days is effected by means of a wheel 16 fixed on the shaft and con-
nected to the cylinder by means of push and pull pawls of special construction
It may be here stated that these special requirements exist viz. that the rotation
of the shaft 1 which is the prime mover of all the mechanism, shall when
advancing the numeral cylinder, also revolve the cylinder 13 step by step and
more slowly than the shaft and daily number cylinder for the reason that the
spaces on the former are more in number than those of the latter, further that the
mechanism shall permit the shaft and numeral cylinder to turn freely backward
without turning the day name cylinder Theso special objects are all accom-
plished by the pawls 17 and 18 acting in connection with annular rows of pins on
the wheels 15 and 16 It will be borne in mind that the wheel 16 is fixed on the
shaft and turns with it, like the cylinders carrying the numbers. But the cylinder

page_text: cylinder turns to expose the numbers in regular order, and is then arrested by
a positive stop (hereinafter to be described) and must then be turned back The
construction contemplates the turning backward of this double cylinder 2 and 6
until the zero point is brought opposite the aperture, when motion in that direction
is arrested In the form shown in Figures 3, 10 and 11 the arresting devices are
simple pins fixed in the end of the telescoping cylinder and which bring up one
against a fixed shoulder on the inside of the head of the case 10 and the other
against a weighted disc hereinafter described The pin which arrests the advance
of the number cylinder is indicated at 28 Figs. 3 and 11
As the cylinder 2 advances to the left this pin projects into a groove 29 in the
head or disc 9 and brings up against a shoulder at the end thereof the shoulder
and pin being so arranged that they come into contact when the greatest day
number 31 of any month is opposite the central aperture If the month on
record be a shorter month the operator stops at the proper number and from that
point turns back. Or if through inadvertence he advance the cylinder too far, it is
easy to readjust it since he can turn back the number cylinder continuously, and
by a back and forth movement through one or more steps or spaces he can adjust
the week day cylinder if displaced The pin 30 in the head 4 of the telescoping
cylinder advancing with the backward movement of the cylinder passes through
the head 7 of cylinder 6 and in like manner as pin 28 strikes against a shoulder
on a weighted wheel or disc 34 shown in Figs. 3 and 8 just inside the head 11 of
the case
This weighted wheel 34 is loose on the sleeve 76 of the head of the case 10 and
has a pin 35 projecting through a slot in said head carrying a pawl which operates
on pins 33 in the inner side of the head of the month cylinder, said slot being
curved as shown in Figs. 6 and 7 on a radius of which the axis is the centre and
is of a length sufficient to give necessary motion to the pawl. The weighted disc
has an offset 96 (Fig. 8) against which the pin may strike The weight is on the
same side with the offset and preferably in it, and the pawl is so arranged on the
weighted wheel that the weight when dropping freely shall throw the pawl to the
rear ready for engagement with the pins of the month cylinder. When the
number cylinders therefore are turned back towards zero, the stop pin is brought
into contact with this offset It is so arranged as to strike it when the figure 1
commences to pass out of sight, and completes the motion when zero is in place,
and the movement of the shaft and number cylinder necessary to expose the zero,
causes the pin in said number cylinder to turn the weighted disc and move the
pawl and month cylinder one step forward and then to stop by reason of the pin
carrying the pawl coming against the end of the slot After that the number
cylinders are advanced by reverse movement through the numbers of the month in
proper order without again moving the month cylinder since the pin does not
strike the disc in its subsequent revolutions, being drawn away by the left hand
movement of the cylinder 2 The pins 33 on the inner side of the month cylinder
are twelve in number and equi-distant, and the pawl advances the cylinder one
twelfth of its circumference by each action These pins project through the wheel
and are acted upon on the outside by a wire spring pawl 77 as shown in Figs
2 and 6 which acts as a yielding stop in like manner to that of the day of the
week cylinder previously described These last named yielding stop pawls are
made preferably in the shape shown, the double inclined projection serving more
accurately to hold the wheel in correct position, and centre the indicating word at
the aperture The arrangement of the weighted disc adapted to oscillate with its
pawl sufficiently to move the month cylinder one twelfth of a revolution, enables
the operator to readjust the record whenever it happens to be disarranged By
repeatedly turning the number cylinder back and forth from one to zero, the month
cylinder can be revolved to any point desired I have found it well to mount
the case on sleeves 75 and 76 The sleeve 76 affords a simple and secure mode
of connecting the weighted discs to the head
For this purpose ears 51 are formed on the inner end of the sleeve, bent outward

page_text: carrying the names of the days, is loose The fixed wheel 16 is provided with an
annular row of pins, ten in number projecting towards the end of the case A.
These in turn push the pawl 17 which raises the swinging rod 22 and this pulls
on the pawl 18 pivoted like the first pawl 17 on the said rod. The shape of
pawl 17 is peculiar as well as its location and this shape and location is fully
illustrated in Figs. 2, 4 and 5 As the shaft is turned carrying the number
cylinder advancing the numbers in their increasing order, the wheel 16 revolving
with the shaft, each pin in turn strikes the face of the offset which is approxi-
mately at right angles to a line drawn from the pivot through the centre of x
As the pin advances it pushes the pawl upwards and backward moving first nearly
in line with the slot 21 and afterwards more and more across that line the result
of the circular movement of the pin and the straight line movement of the pawl
and rod being, that the latter moves a less distance than the former But the
advancing pin rides under the apex of the pawl whose sides and ineet and the
pawl then falls into the next space between the pins In falling, it moves in the
line in which it was raised the lower end y resting on a pin p fixed in the
end of the case just above the path of the circular row of pins and the other
end being supported by its pivoting rod 22 It will be clear from an inspection
of the Drawing that in the reverse movement of shaft with its directly
connected cylinders and wheel 16 the side of the pawl will ride freely over the
pins and no movement of the rod 22 takes place The pull pawl is of ordinary
construction It works on a circular row of pins fourteen in number set in the
head 15 of the day cylinder 13 and projecting towards the wheel 16 the wheel
and head forming a guide for the pawl and in the same manner the wheel 16 and
end of the box form a guide for the push pawl It will be apparent that when the
pawl 17 and rod 22 rise, they move the pawl 18 and the day cylinder 13 a single
step It will be borne in mind that to bring a new number into line the shaft
and the cylinders 2 and 6 make a tenth revolution, but to bring a new name into
line only one fourteenth revolution is required of the day cylinder 13 As the said
cylinder 13 is moved by the shaft which carries positively the number cylinders a
certain amount of motion must be lost in this connecting mechanism Some of
this is lost by the peculiar construction and arrangement of the pawl and its
connections heretofore described and some necessarily in the engagement of the
pawl 18 with its pins Further difference of movement and the exact amount of
it is obtained by setting the pins in the head of cylinder 13 in a circle smaller than
those of the wheel 16 A pin 53 is set in the end of the box just above the pawls
to prevent their displacement, should the box happen to be turned upside down
The rod 22 has been found a convenient mode of suspending the pawls, said rod
resting at one end in the slot which guides it and the pawls and at the other in a
staple as shown in Fig 3 Other means however may be devised for connecting
holding and directing the pawls Yielding stop mechanism is desirable for all the
cylinders That for the numeral cylinders 2 and 6 and the shaft acts directly
upon the wheel 16 and is shown in Figs. 4 and 5 It consists of a pawl 23
pivoted on a stud 24 It carries a small pulley 26 adapted to pass nearly
half way into the space between the pins on wheel 16 and to ride over such pins
It is pressed upward by a horizontal arm of spring 25 and when the shaft is
turned gives it a step by step motion but it yields enough to permit free con-
tinuous motion The pawl 23 and its pulley may be located partly in a recess in
the end of the box The upright end of spring 25 is provided with a double
bend 27 adapted to fit between the pins of the disc 15 holding it by a yielding
stop with the same action as the pawl 23. Small ribs 128 preferably of wire
placed round the case 10 serve as bearings for the cylinders 13 and 14 and lessen
the friction The cylinder 14 placed over the other end of the case 10 and carrying
the names of the months, corresponds in shape and location to the cylinder 13,
except that it is a trifle longer But obviously it requires only one movement (or
movement one space) each month and that is at the beginning of the current
number of the days thereof It will be borne in mind that the day number

page_text: at right angles thereto and fitted to pass through slots 52 in the weighted disc,
there being space left between the ears and the head to admit the disc and permit
it to turn freely on the sleeve The disc is turned aside and the pawl carrying
pin, inserted through its proper slot, prevents the ears and their slots from
registering with each other. For a more perfect and elaborate grade of machine I
modify the stop mechanism and cause the number cylinders to be arrested at the
figure representing the last day of the particular month This is accomplished by
The head 11 of
mechanism shown in Figs 12, 13 and 14 in the following manner
the cylindrical caso is provided with the same form of weighted disc 34 pin
extending through curved slot in head 11 and pawl on opposite side engaging with
the twelve pins in annular row on the inner face of the head of cylinder 14 The
stop pin in this form is a single pin or rod 46 thrust forward by means of the
movement of the telescoping cylinder so that it is caused to project in the same
direction through the head of cylinder 6 when the cylinder 2 is approaching either
end of its movement This special construction will be hereinafter more fully
described The rod thus projecting at both extremes will at one extreme, strike
on one side of the projection 96 on the weighted disc 34, and then at the other
extreme on the other side
The slot in the head 11 is about three times the length of that in the form first
described and the weighted disc has three times the possible movement
It will be borne in mind that the number cylinders have an upward surface
movement in front when changing the daily record in its advancing order and
therefore the rod when projected at the last of the month will strike the upper or
rear side of the projection on the weighted disc The disc therefore is held to
three various positions corresponding to the three different lengths of months
When held with the offsets farthest to the rear or in such position that the rod
will strike earlier, the number cylinder is arrested when the number 29 is displayed
(that being the maximum of February and no note being taken of its variations)
when in a second position less removed to the rear, the cylinder is stopped when
the figure 30 is displayed and the last position of the weighted disc permits
This adjustment is
movement of the numeral cylinder to the number 31
accomplished by means of a latch 37 on the side of the case head 11 opposite the
weighted disc as shown in Fig. 12 and in 14 which shows the outer face of the
case head This latch is pivoted at the end of a curved slot 38 similar to the
upper slot in said head in which moves a pin 39 set in the face of the weighted
disc This slot is on the lower side of the head as shown in Fig. 14 and the latch
drops by gravity The latch has three equi-distant shoulders or steps l, m, n, and
when it is at its lowest limit the step larrests the pin 39 and thereby the weighted
disc with its offset in position to stop the cylinder when the figure 29 is displayed
Raised a little higher the latch lets the pin pass to the second step m in which
position it is shown in Fig. 14 and when held higher still, to the last step n,
stopping the cylinder at 30 and 31 respectively The position of the latch is
regulated by means of an arın 40 attached thereto and made in the shape shown
to permit it to ride over the pins 41 which project inwardly on the month cylinder
head There are three rows of pins thus projecting on this head
The inner row 42 twelve in number are to operate in connection with the pawl
and are the same as the pins 33 in the other form The two outer rows act on
the arm of the latch The two outer circles of dotted lines in Fig. 13 respectively
indicate the circles formed by rows of 30 and 31 day pins and the radial lines
indicate the necessary difference in their radial position for it will be noticed that
while each of the 30 day pins (in the outer row) is in line with two of the pins 42,
the 31 day pins forming the inner row are placed a little off the radial line This
is explained by the fact that as the centre of the face of arm 40 must bear on the
pins and such arm moves in the arc of a circle, were the 31 day pins placed in the
same radial line as the others the arm would not bear on them correctly
consequently they are placed the required distance out of lino It will be noticed
that there is no pin in the outer circle corresponding to one of the radial ling

page_text: This indicates the month of February the arm of the latch being then allowed to
drop to the full extent which brings step into the path of pin 39 and which is
determined by the leg of the arm 40 which passes through the latch, striking
against the edge of the slot The next pin is on the inner circle and lifts the
latch to its extreme limit for a 31 day month, March
The next pin represents a 30 day month-April, and lifts the latch to the
intermediate position The other pins will be observed to be arranged in their
order for the months following Obviously by this arrangement the pawl 36 some-
times moves through two and three spaces In order that the pawl may not act
on more than one pin at a time I have arranged a shield 44 over the pawl pins 42
so that the pawl for the second or third space rests on the shield and cannot act
on more than one of the pins A bent pin 55 prevents too great outward move-
ment of the pawl, preventing it from becoming entangled with the outer rows of
pins should the box be upset The devices for giving motion to the rod 46 are
shown in Fig 12 On the main shaft 1 is pivoted a lever 45 to which is attached
the said rod 46 this rod being supported in the eye of a guide pin 47. The rod
passes with a large clearance through the head 4 of cylinder 2 and with a close
guiding fit through the head of cylinder 6. A spring 60 holds the lever normally
with rod retracted On head 4 is a screw pin 48 and on head 3, another, 49.
These are adjusted on the cylinder heads as to length and are arranged to strike
opposite ends of the lever Thus whether the cylinder 2 be moved to left or right,
one of the pins when the cylinder approaches the end of its movement, will strike
the lever and push out the rod 46. The movement due to the spiral is gradual
and the rod 46 and offset on the weighted disc must be adjusted to each other and
to the head so that the rod will have bearing on the offset at its first impact and
not bind against the head 11 in the latter part of its movement To prevent this
binding the head is cut away or reduced in thickness at the required point The
rear limit in this system of stops is the same as in the other form The rod on the
backward motion of the cylinder strikes against the front side of the offset on the
weighted wheel and the pin 35 then brings up against the end of the slot in the
head, having moved the next month record into place, as the zero figure comes
opposite the apersure On the front of the apparatus I arrange in special and
convenient relation to the moving record, a fixed calendar shown at 91 This is
printed on two strips of paper the upper having the first and the lower the latter
half of the year, the year being preferably in central position in each They are
set in a light frame supporting an opaque front in which the horizontally arranged
apertures are made This light frame is set removably into the hinged frame
which carries the glass I use a series of these calendar strips, one placed under-
neath the other in proper order so that one may be removed when out of date An
advantage arises from dividing the year into periods of six months on the slips
since the upper slip of one year may be removed before that year has expired
leaving the first six mouths of the next year exposed, so that in the last part of the
year the record of the ensuing year may be partly visible Records for any number
of years desired may be placed one underneath another I attach them by the
edge next the frame so that they may be turned up and the calendar for any
future year examined The old calendars may be folded when removed from their
connections, and held by a clip and placed in the bottom of the box underneath the
cylinders The operation of the apparatus has been explained with sufficient
fullness in connection with the description of the parts It may be necessary only
to add that the record when disarranged may be brought into proper order by first
turning back the shaft and number cylinder to zero, whereby oscillation from
0 to 1, the proper month may be represented at the aperture Afterward the shaft is
turned forward to the proper number and the name of the day required may be
brought into place as heretofore explained In Fig 16 I have shown a modification
of the yielding stop mechanism illustrated in Figs 4 and 5. Instead of the pawl 23
carrying the friction roller 26 and pressed upward by the spring 25 bearing on a
pin on the pawl, I use the spring itself as a pawl, in the manner shown in Fig 16

page_text: by extending it a sufficient distance and forming a double incline or obtuse angular
bend, which fits in the space between the pins in the same manner as the wheel
before described This construction has the merit of greater simplicity I have
found that the ferrules or sleeves attached to the heads of the case 10 on which
the heads of the month and day of the week cylinders run may be dispensed with
and these heads as well as all the heads and wheels may have their bearings
directly upon the shaft 1 as shown in Fig 12 In this plan the case 10 is held in
correct position on the shaft by a pin 26 inserted in the shaft just outside the
head 9 thus preventing any crowding or binding of the weighted disc between the
head 11 and the enlarged part of the shaft Other pins can also be inserted in the
shaft to keep the month and day of the week cylinders in position
Having thus described the Invention of my foreign correspondent and how the
same may be practically employed what I claim and desire to secure by Letters
Patent is
1st In a calendar, a cylinder having a series of unit figures from one to zero
inclusive arranged in direct line around its periphery in combination with a
cylinder telescoping therewith and provided with a spirally arranged series of
numerals adapted to not as decimal figures with the aforesaid unit figures
substantially as described
2nd The described series of calendar slips, cach representing six months of
successive years in proper order one above and the other below the line of
apertures said slips being suitably attached to the front or frame substantially as
described and set forth
3rd The cylinders carrying numerals indicating days of the month in combination
with a cylinder having the names of the days of the week and with intermediate
connecting mechanism whereby the said numeral cylinder carries the name
cylinder step by step in its advance but leaves it undisturbed in reverse movement,
as set forth
4th The cylinders carrying numerals indicating days of the month in combination
with cylinders having naines of the days and months respectively and with inter-
mediate connecting mechanism whereby the advance only of the numeral cylinders
moves the day name cylinder and reverse movement only of the same moves the
month name cylinder substantially as described and set forth
5th The numeral carrying cylinders in combination with the cylinder carrying
the names of the month and with pawl and stop mechanism whereby the last
backward movement only of the numeral cylinders noves the month cylinder one
step as set forth
6th In a calendar, and in combination, cylinders carrying on their periphery
numbers of the days of months rotated by positive movement of shaft, a cylinder
carrying names of the days, and intermediate mechanism between the shaft and
name cylinder adapted to transmit to the said name cylinder an amount of motion
varied from that of the shaft substantially as described
7th In combination the cylinder 6 fixed on shaft 1, the cylinder 2 connected to
shaft by spline and the fixed spiral 8 substantially as and for the purposes set
forth
8th In combination the fixed case 10 having heads 9 and 11 and central
opening, the cylinder û fixed to shaft 1, the cylinder 2 telescoping therein, and the
spiral S substantially as set forth.
9th In combination cylinder 6 fixed to shaft, cylinder 2 telescoping therein,
fixed case 10 and cylinder 13 carrying the names of the days of the week and
operated from the shaft by the push and pull pawls substantially as described
10th The cylinders 2 and 6 and the fixed case 10 all in combination with the
wheel 16 shaft 1 and the connected pawls 17 and 18 substantially as described
11th The combination of the rod 22 pawls 17 and 18, wheel 16 and bead 15
both provided with pins as described and set forth
12th The wheel 16 and head 15 provided with pins in combination with the

page_text: connected push and pull pawls 17 and 18 and the yielding stop pawls substantially
as described
13th In a calendar, the combination of the fixed cylinder carrying the unit
figures, telescoping cylinder carrying the spirally arranged decimal figures, the
stop pin or pins in the head of the telescoping cylinder and the shoulders adapted
to arrest the rotation of the telescoping cylinder all as described and set forth.
14th The head 11 of the fixed case 2 slotted as described in combination with
weighted wheel 34 and pawl carried thereon by pin extending through slot in
head 11 and connecting with pins in the head of cylinder 14 substantially as set
forth
15th In combination with a cylinder having characters arranged spirally upon
its surface and with a fixed case having openings to display such characters, the
revolving shaft 1, fixed spiral rod surrounding said shaft and the cylinder head
having a hole adapted to the shaft and a surface bearing on the shaft, approxi-
mately spiral, said surface being adapted to pass between the coils and the over-
lapping or meeting ends of said spiral bearing surface saddlling closely the spiral
rod all the parts being combined in a calendar and operating substantially as
described
16th In combination with the cylinders of a calendar having characters
indicating the numbers of the days of the month and adapted to turn to bring
these characters successively to view and with a cylinder carrying the names of
the months arranged in proper order, a variable arresting device regulated by the
month cylinder and adapted to arrest the numeral cylinder at the proper point
for each month substantially as described and set forth
17th The combination of a cylinder having stop pin or rod and turning on its
axis to bring successive numbers representing days of the month to an aperture
a weighted disc 34 having offset 96 for said stop pin or rod pawl 35 acting on
month cylinder, latch 37 and devices for operating the same the said latch acting
on pin 39 of the weighted disc substantially as described
18th The combination of the weighted disc having offset adapted to act in
connection with stop pin or rod on the cylinder and carrying pawl 35, the latch
pivoted on the head 11 having stops to act on pin 39 in weighted disc and arm 40
adapted to be operated upon by the pins upon the head of the month cylinder the
whole constructed and operating as described
19th The improved double pawl 19, 23 formed out of one piece of wire having
an eye formed to fit over its holding pin and with the pawls extending on opposito
sides of the wheel said pawl being formed with V shaped bends to form yielding
stops and adapted to the pins of the wheel and head and in combination therewith
substantially as described
In witness whereof I the said Philip Middleton Justice have hereunto set my
hand and seal this Fourteenth day of August in the year of our Lord One
thousand sight hundred and nighter twen
Signed, sealed and delivered
in the presence of
HENRY B. HATCHWELL
Southampton Buildings
Chancery Lane
W.C.
PHILIP M. JUSTICE. (L.S.)