An Improved Device for Adding, Subtracting, and Multiplying, of any Number of Figures.
Year: 1897

page_text: Date of Application, 23rd July, 1897-Accepted, 28th Aug., 1897
COMPLETE SPECIFICATION.
An Improved Device for Adding, Subtracting, and Multiplying, of
any Number of Figures.
I, LEVY MAYBAUM, of 763 Broad Street, in the City of Newark, County of Essex,
and the State of New Jersey, U.S.A., Gentleman, 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 :-
The object of my present invention is to provide a simple, reliable and efficient
device for adding, subtracting, and multiplying etc., of any number of figures, which
device will be found of great advantage and utility in schools, stores, accountants
offices, and in general, wherever extensive calculations have to be made.
The invention consists in the improved calculator, in its revolving graduated disc
co-operating with a stationary scale and pivoted pointer, and in the combination and
arrangements of the various parts, substantially as will be hereinafter more fully
described and finally embodied in the clauses of the claims.
Referring to the accompanying drawing, in which like letters of reference indicate
corresponding parts in each of the several Figs. Fig. 1, is a top plan view of my
improved calculating device; Fig. 2, a sectional view on the line xx of Fig. 1; Fig. 3,
an enlarged front elevation of the spring controlled pointer, and Fig. 4, a cross
sectional view through the latter, illustrating its engaging means with the teeth of
the revolving disc.
In said drawing, a represents a frame plate or bed provided with a circular recess b,
having at or near its outer periphery an annular groove or channel c, in which are
Said
arranged a series of balls d adapted to form a suitable hearing for the disc e.
disc is revolubly mounted on the central vertical pin or stud f, provided with a head g,
and also serving as a fulcrum for the hand or pointer h, which latter can be operated
and turned independent of the revolving disc e.
The disc e is provided with a series of concentrically arranged rings e¹, e², es, con-
taining graduation marks from 1 to 500-from 500 to 1000-and from 1000 to 1500
respectively, and is also provided with an annular rack-bar m concentrically arranged
with the annular rings e¹, e², es, and having its teeth conforming to and in alignment
with the graduation marks on said rings.
The teeth of said rack-bar are adapted to be engaged by a slightly curved or bent
piń n, carried by and projecting downwardly from the haud or pointer h, which latter
is provided with a knob or handle k and is kept-with its pin n-out of engagement
with the rack-bar in, by means of a spring i, carried by said hand or pointer
and slidingly arranged on the frame plate or bed a, as clearly illustrated in the
drawing.
On one side of said frame plate or bed is arranged a scale o provided with
graduation marks from 0 to 100, and on each end of said vernier-with a stop p
(and q) of any suitable construction, and adapted to limit the motion of the hand or
pointer h, as 'will be hereinafter described.
Diametrically opposite the centre of said scale o, and arranged on the frame plate or
bed a in any desired manner, is a pointer or arrow 8, forming the starting or zero

page_text: point, when calculations are to be made, and for that purpose the pointer or arrow r
on the disc e is to be brought in alignment with said pointer or arrow s, as will be
manifest.
On the disc e is arranged-in any desired manner-an upwardly extending pin or
stud t, adapted to engage the arms u, u¹, u², respectively, which arms project from a
hand or pointer u³, pivotally secured as at ut, to the frame plate or bed a and adapted
to indicate the figures 500, 1000, and 1500, that is to say, that the disc e has been
rotated once, twice and three times respectively.
The disc e is also provided at a suitable place with a depression a°, for conveniently
returning said disc to its normal position, and it will be manifest, that more than
one of said depressions (or slight projections) can be arranged on said disc if so
desired.
It is very essential for the accurate working of the device that the pin n is slightly
curved or bent at its lower end, so that said pin is bound to engage the centre of
its respective knotch (formed on the rack-barn), especially when the device is being
rapidly operated.
In operation when a series of columns of figures are to be added, the disc e is first
returned to its normal position, that is to say, the pointer or arrow is brought in
alignment with the arrow or pointer s. The indicator or pointer u³ is also returned
to its normal position, that is to say, is set to point at zero-the position indicated in'
Figure 1 of the drawing.
11
Said column is divided up into two columns, each containing two figures, of which
the right hand column thus formed is added first in the following manner: The
pointer his moved to graduation mark 99 on scale o, and is then pressed downwards,
until its pin n firmly engages the respective knotch in the rack-bar m of disc e.
The pointer is kept in depressed position and moved backwards, that is to say,
left to right until it is stopped by the stop q. The arrow s will at that moment point
at 99 on the outer ring e¹ of said disc e.
from
The pointer is then released from its engagement with the rack-bar m and is moved
from right to left to the graduation mark 76 (on the scale o), when it is again brought
into engagement with the disc e, and moved backwards to the stop q.
will point at graduation mark 175 of the outer ring e¹.
The arrow 8
By again moving the pointer h to mark 13 on vernier o, bringing said pointer into
engagement with the disc e, and turning the latter backwards until the pointer is
stopped by the stop q, the arrow s will point at graduation mark 188, that is to say,
at the sum of the double column just added.
66
one
"
The disc e is now returned to its normal position and the operation as above
described regarding the right hand column is now repeated with the left hand column,
but it must be remarked that in setting the pointer h for the first figure "39,"
is added, that is to say, the pointer is set at graduation mark 40 on the vernier, and
corresponds to the so called carrying of figures in the ordinary adding of columns.
However should for instance the figure to be carried be a double figure, (like 69),
and the first figure of the second double column would in addition to that double
figure amount to more than 100, then the pointer h is moved to that last mentioned
figure on the scale o, is then brought into engagement with the disc e and turned
backwards to the stop g. The arrows will indicate said last mentioned double figure
on one of the rings of the disc e.
The further operation of adding is then the same as heretofore described.
Whenever the disc e has made one complete revolution, the pin t has engaged the
arm u and moved the pointer u³ to mark 500, and a second and third revolution of
said disc e, will bring said pointer u³ to the marks 1000, and 1500 respectively, as
will be manifest.

page_text: When the device is to be used for subtracting, the operation heretofore
described is reversed, and it may also be remarked that the same device can be
used for multiplying, by operating the pointer and disc in a manner similar to that
of adding.
I do not intend to limit myself to the precise construction as shown and
described, as various alterations can be made without changing the scope of my
invention.
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. A calculator consisting of a graduated disc, a graduated scale co-operating with
said disc, one of said parts being movable with relation to the other, and a hand
or pointer co-operating with said dise and scale, substantially as and for the purposes
described.
2. A calculator consisting of a graduated disc, a graduated scale co-operating with
said disc, one of said parts being movable with relation to the other, a hand or pointer
co-operating with said dise and scale, and an indicator controlled by said dise or scale,
substantially as and for the purposes described.
3. A calculator consisting of a revolubly mounted graduated disc, a stationary
graduated scale concentrically arranged with said disc, a pivoted hand or pointer
independently movable of the disc, and means for connecting said pointer with the
disc at intervals during the operation, substantially as and for the purposes
described.
4. A calculator consisting of a frame, a graduated disc revolubly mounted in said
frame, a stationary graduated scale concentrically arranged with said disc, a hand or
pointer loosely mounted on the fulcrum of the disc, and provided with a downwardly
extending pin, and a toothed rack on the disc and concentrically arranged with the
graduation marks on the latter and adapted to be engaged by the downwardly
extending pin of the hand or pointer, substantially as and for the purposes
described.
5. A calculator consisting of a frame, a graduated disc revolubly mounted in said
frame, a stationary graduated scale concentrically arranged with said disc, a hand or
pointer loosely mounted on the fulcrum of the disc, and provided with a downwardly
extending pin, a toothed rack on the disc and concentrically arranged with the
graduation marks on the latter and adapted to be engaged by the downwardly
extending pin of the said hand or pointer, an indicator on the frame, and means
for operating said indicator by the revolving disc, substantially as and for the purposes
described.
6. calculator consisting of a frame, a graduated disc revolubly mounted in said
frame, a stationary graduated scale concentrically arranged with said disc, a hand or
pointer loosely mounted on the fulcrum of the disc, and provided with a downwardly
extending pin, a toothed rack on the disc and concentrically arranged with the
graduation marks on the latter and adapted to be engaged by the downwardly
extending pin of the hand or pointer, an indicator on the frame, means for operating
said indicator by the revolving disc, and a spring carried by the hand or pointer
for normally holding its pin out of engagement with the toothed rack, substantially
as described.
"
1007
J. P. BAYLY,
18 Fulham Place, London, W., Agent for the Applicant.