An Improved Device for use in Reckoning Time.
Year: 1898

page_text: Date of Application, 20th Mar., 1898-Accepted, 30th Apr., 1898
COMPLETE SPECIFICATION.
An Improved Device for use in Reckoning Time.
I, FRANK ROLAND, of Wepener, Orange Free State, South Africa, Book-keeper,
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 has for its object an improved device for use in reckoning time
and consists essentially in an arrangement of concentric discs upon a pivot, one of
the said discs being marked with the months and the days of the month and the
other with the days of the year so that the number of days between any two dates
can be readily calculated.
In order to more clearly indicate the nature of this invention reference is had to
the accompanying sheet of illustrative drawings in which Fig. 1 is an elevation of a
device constructed according to this invention and Fig. 2 is a plan of the same.
The lower disc a is divided on its outer edge into 365 equal parts and figured.
accordingly, and upon the same pivot a second disc b slightly less in diameter than
the disc a is fitted. This disc b is also divided upon its outer edge into 365 equal
divisions but is further divided up into the 12 months of the year each month having
as many divisions as there are days and being numbered accordingly. On the
drawings only some of the divisions and figures are shown but in practice the discs
would be about a foot in diameter and all the divisions would be marked and they
would be numbered sufficiently for easy calculation.
The divisions on the two discs ab will of course correspond to one another.
The pivot and thumb screw d will allow of one disc being moved relatively to
the other.
The method of using the device is as follows:-
If the number of days between any two dates is required, the inner disc b is
turned until the earlier of the two dates is opposite 365 on the outer disc a. The
other date required will then come opposite a number and this number will be the
number of days between the two dates.
For instance, supposing the number of days between the 3rd March and the
22nd September is required, the 3rd March is turned to 365 on the outer disc and
the 22nd September will then come level with 203 which is the required number of
days.
In Leap Year, in calculations where February 29th is involved 1 must be added
to the result.
It will thus be seen that a device is provided whereby the number of days
between any two dates can be readily calculated. This device is specially useful for
bankers and other business men by whom such calculations often have to be made.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I claim
is:-
(1) An improved device for use in reckoning the numbers of days between any

page_text: two dates consisting of two discs, concentrically pivoted together, one divided into
365 divisions and the other divided according to the months and the number of days
in each month, so that when the latter disc is turned until the earlier of the two
dates comes opposite the number 365 on the other disc, the number opposite the
other date will indicate the number of days between the two dates substantially as 5
described.
ו...
.
0011 1
1000
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.