Improvements in Adding Machines.
Year: 1890

page_text: Date of Application, 22nd Oct., 1890-Accepted, 22nd Nov., 1890
MAת זת.
Improvements in Adding Machines.
I, DUDLEY IRVINE CRAIG, of Silver King, in the County of Pinal and Territory
of Arizona, United States of America, Stock Farmer and Farmer, do hereby declare
the nature of my invention for IMPROVEMENTS IN ADDING MACHINES, and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
My invention relates to improvements in adding machines, and among other things
the object of my invention is to provide the machine with mechanism for automati-
cally and accurately adding one or more columns of figures by simply depressing the
desired keys of a series of keys which form a part of the machine; to provide
mechanism for placing the prime moving mechanism in condition for operation
without affecting the normal position of the adding contrivances of the machine; to
provide mechanism for independently returning either the primary tens or hundreds
adding wheels and arbors to their normal positions after adding the column of figures,
and to improve the machine in minor details with a view to promoting simplicity of
construction and efficiency in operation.
With these and other ends in view the first part of my invention consists in adding
mechanism comprising a series of keys, each having an arm or projection which
acts on one of a series of rods or arms of a rock-shaft, a primary tens adding-wheel,
a hundreds-wheel arranged to be moved one notch or step at each complete revolution
of the tens-wheel, a master gear-wheel which is normally out of engagement, with the
tens adding-wheel, mechanism for impelling the tens adding-wheel in one direction,
a brake for normally arresting the motion of the tens adding-wheel, and devices
operated by the rock-shaft to simultaneously throw the master-gear into engagement
with the primary tens adding-wheel and withdraw the brake from engagement with
said primary or tens adding-wheel, whereby the primary adding-wheel and master-gear
are rotated by the prime moving mechanism until said wheels are arrested by a stop,
which is thrown into the path of the master-gear by the depressed key, which starts
the machine in motion. Each key, of which there are ninety-nine in number, has its
rod connected to a lever, which levers are compactly arranged in the lower part of
the machine, and to the other end of each key-lever is connected a vertically-movable
stop or pin which normally lies below the plane of rotation of the master-gear. The
stops or pins are arranged in concentric banks or rows around the periphery of
the master-gear, the number of stops corresponding to the number of keys, and the
master-gear has a projection or stop which extends beyond its periphery, to be struck
by the key-stop when the latter is lifted, the master-gear turning the desired number
cogs before it is arrested by the key-stop. Thus, if the key 5 is depressed, the
master-gear and primary adding-wheel move five cogs. If the key 50 is depressed,
said wheels turn fifty cogs before the key-stop 50 arrests the motion of the master-
gear and primary adding-wheel.
of
My invention further consists in a prime moving mechanism for actuating the
primary or tens adding-wheel when released from its brake, which prime moving
mechanism consists of a series of geared wheels and a strong motive spring. This
spring can be readily wound up without affecting the other parts of the apparatus
by an intermediate train of gears, one of which has a loose pinion with which meshes a
worm on a crank-shaft adapted to be rotated by the hand, the loose pinion of the
train of gears having means or a ratchet for preventing retrograde movement of said
pinion.
My invention further consists in devices for independently returning either the
primary adding-wheel or the hundreds adding-wheel to its normal position. The
device for returning the primary tens-wheel to its normal position at zero consists of

page_text: a key located near the tens-dial and having its rod depending into the case, so as to
contact with the brake for arresting the primary adding-wheel, so that when this key-
rod is depressed the brake will be withdrawn from said primary adding-wheel, and
the latter will be returned to zero, (the master-gear having been previously dis-
engaged,) said primary adding-wheel having a projection which comes in contact
with a stop-arm on the key-rod when the indicator or hand of the primary
adding-wheel points at zero. The hundreds adding-wheel is returned to zero by
a spring, which is especially provided for this purpose, and is carried within
the periphery of said wheel; and this hundreds-wheel is prevented from retrograde
movement while in the act of adding up the figures, and is actuated by the primary
adding-wheel by a pawl which engages with a ratchet on said wheel. In order there-
fore to return the hundreds adding-wheel to zero after the column of figures has been
added; it is necessary to disengage the pawl from the ratchet on the hundreds-wheel,
and with this end in view I mount the hundreds-wheel on an endwise-movable arbor
which is held in normal position by a flat spring. To this spring is connected the rod
of a separate key, which, when depressed, lowers the flat spring and hundreds-wheel,
so that the ratchet of the latter is disengaged from the pawl and the hundreds-wheel
can be turned in the reverse direction by its internal spring, the motion of the hundreds-
wheel being arrested when the hand or indicator thereof points to zero by a projection
on the wheel, which comes in contact with a fixed stop within the case.
My invention further consists in the novel construction and arrangement of parts
and combination of devices, as will be hereinafter more fully pointed out, and specified
in the claims.
Referring to the accompanying drawings, Fig. I is a plan view of my machine with
the cover removed.
Fig. II is a longitudinal sectional view on the line 2 2 of Fig. I.
Fig. III is a detail view of one of the keys and its operating mechanism.
Fig. IV is a detail plan view of the prime moving mechanism.
Fig. V is a transverse vertical sectional view on the line 5, 5 of Fig. 1.
Fig. VI is a top plan view of the machine, showing the arrangement of the keys,
dials, &c.
Fig. VII is a detail view showing arrangement of the levers and stops.
Fig. VIII is a detail view showing the projection on the tens-wheel I for moving
the hundreds-wheel 3.
Like numerals of reference denote corresponding parts in all the figures of the
drawings, referring to which-
63 denotes the outer shell or case, which is divided into an upper and lower com-
partment by a floor 41. Within the shell is secured, upon a suitable frame, the
prime moving mechanism of the machine, which mechanism consists of a train of
gear-wheels 27, 28, and 29, which are suitably geared together. The wheel 27 is
journaled on a sleeve 24¹, which surrounds an arbor 24, which carries the primary
tens adding-wheel 1, which is provided on its circumference with a series of cogs or
gear-teeth, one hundred in number.
45 designates an arbor or shaft, which is suitably secured in the upper compart-
ment of the shell or case 63, and which carries a master-gear 2 of one hundred and
forty cogs, and having a projection 23 secured to the same and extended beyond its
periphery. This master-gear is normally out of gear with the primary adding-wheel,
and is adapted, by means to be hereinafter described, to be thrown into gear with said
primary adding-wheel 1. This master-gear is normally held out of contact with said
primary adding-wheel by a flat spring 61, one end of which is rigidly attached to the
under side of the floor 41, and the free end of this spring 61 bears against the lower
end of the arbor 45 to lift the latter and the master-gear vertically, and thus hold the
master-gear out of gear with the primary adding-wheel. To the floor 41 of the shell
or case is secured a stop. 20, against which the lateral projection 23 on master-gear 2
normally rests.
3 designates the hundreds adding-wheel of one hundred cogs, which is mounted
on an endwise-movable arbor 25. This hundreds adding-wheel 3 is adapted to be

page_text: moved one notch or tooth at a time by a pin or projection 26¹ on the under side of
the primary adding-wheel 1, which meshes with its cogs. Thus for every complete
revolution of the primary adding-wheel 1 the hundreds adding-wheel 3 will be turned
one cog or tooth.
To the upper ends of the wheel-arbors 24 25 of the primary and hundreds adding-
wheels are secured hands or pointers 52 53, which move over the dials 54 55 on the
upper face of the shell or case 63, respectively, and these adding-wheels are normally
in such position that the respective pointers thereof indicate or point to zero on the
dials.
Near the forward end of the upper compartment of the enclosing-case 63 is journaled
a horizontal rock-shaft 8, having rigidly secured thereto a series of horizontal arms 9,
an arm 10, and an arm 11. This rock-shaft 8 is held normally in a stationary
position by means of the coiled spring 14; but when pressure is applied to anyone of the
series of arms 9 the shaft 8 turns or rocks in its bearings, and the arms 9 10 11 are
consequently depressed. The free end of the arm 11 on the shaft 8 bears against the
upper end of wheel-arbor 45 of the master-gear, and it is adapted to depress said
arbor, and thus cause the gear-teeth on the master-gear 2 to mesh with the teeth on
the primary adding-wheel 1. The arm 10 rests on or over a flat spring 12, which con-
stitutes the brake for arresting the movement of the primary adding-wheel, one end
of which spring-brake is rigidly secured to a frame within the case and the other end
of which carries a pin or projection 22, which normally fits between two cogs or gear-
teeth of the primary adding-wheel 1, and thus prevents rotation of said primary
adding-wheel. The brake is adapted to withdraw the projection 22 from between the
teeth of the primary adding-wheel 1, and thus allow said adding-wheel to be set in
motion by the prime moving mechanism of the machine.
38 designates a bank of keys, which are arranged concentric with the master-gear 2
within said case or shell. Each key 38 is mounted on or carried by one end of a
vertical rod 34, which rod passes down through the case or shell and the floor 41,
and said rod is connected at its lower end to one end of a horizontal lever 32. The
fulcrum-block 40 of this key-lever is fastened to the floor 42 of the case or shell 63,
and to the other end of the lever 32 is secured or connected a short vertical stop 21,
which, when the key 38 and rod 34 are depressed, passes through a perforation
in the floor 41, and is projected directly in the path of the projection or pin 23 on
the master-gear to arrest the motion of said master-gear and the primary adding-
wheel when the same have turned the number of teeth corresponding to the number
of the key. The levers 32 are arranged in two tiers, one above the other, as shown
in Fig. II, but said tiers or rows of levers are of different lengths, according to the
position of the keys to which they are connected on the key-board 59. Thus
the levers connected to keys which are in the row nearest the master-gear are the
shortest, while the levers whose keys are in the last row from the master-gear are the
longest, as is obvious.
Each rod 34 of the series of keys carries an arm or member 35, which extends
at right angles from the rod, and the free end of said arm rests on one of the arms 9
of the shaft 8. Around each key-rod 34, between the key 38 and the upper face of
the case or shell, is a coiled spring 37, which lifts the rod 34 and its attached key.
The keys 38 are arranged compactly on the key-board 59 in concentric rows with
the master gear-wheel 2 within the case or shell, and the vertically-movable stops 21,
which are actuated by the key-levers 32, are arranged in like manner within the
lower compartment of the shell or case, said stops being normally arranged below
and out of the path of the projection 23 on the master-gear. The keys and vertically-
movable key-stops are arranged in transverse series, as indicated in Fig. VII. Thus
the key No. 2 and its stop are arranged in rear of and slightly out of line with keys
No. 1 and No. 3. and the stops thereof, and the key No. 4 and its stop 21 are
arranged in the same manner with relation to the keys Nos. 3 and 5 and their stops.
The other keys and stops are arranged in the same manner, which is important, as
the stops are thus compactly disposed to permit the employment of a large number
of such stops and the arrangement of the same in such manner as to permit the

page_text: master-gear to turn the desired number of teeth. There are ninety-nine (99) keys
employed, numbered from 1 to 99, inclusive, and a corresponding number of key-levers
and vertically-movable stops 21.
The end wise-movable arbor 25 of the hundreds adding-wheel is provided with a
shoulder, on which rests one end of an arm 19, whose other end is rigidly attached
to a rocking-shaft 7, suitably journaled in the case or shell, and said shaft
is provided with a spring 15 for normally maintaining the shaft 7 in such position
that the arm 19 is in a horizontal position To the arm 19, at a point midway of its
length, is connected a vertical rod 58, and to the upper end of this rod is secured a
key 50 for depressing the rod and arm 19 and lowering the adding-wheel. Around
the rod 58 and between the lower side of the key 50 and the upper face of the case 63
is wound a coiled spring 37' for lifting the rod and key.
The lower end of the wheel-arbor 25 of the hundreds-wheel rests on the free end of
a flat spring 59', which is rigidly secured at its other end to the lower side of the floor 41,
whereby the hundreds-wheel is normally raised so that the pawl thereof normally
engages with the ratchet on said hundreds-wheel.
One of the arms or spokes of the hundreds-wheel 3 has secured thereto a pin or
projection 43, which, when the hand or pointer 53 on the upper end of the shaft 25 of
said hundreds-wheel points to zero, is in contact with a depending fixed stop 48 on
the lower face of the upper side of the case 63.
The hundreds-wheel 3 is prevented from backward movement while in its normal
raised position by a pawl 17, which is pivoted on the frame within the case, and said
pawl is kept in engagement with the wheel 3 by means of a curved spring 16, as
shown. (See Fig. 1.)
18 represents a stop fixed to the floor 41 of the shell or case to keep the pawl 17
in position and not interfere with the reverse motion of the ratchet of the hundreds-
wheel 3 when said hundreds-wheel is lowered by pressure exerted on key 50, whereby
the hundreds-wheel and its ratchet are disengaged from the check-pawl and are free
to turn in the reverse direction under the influence of the spring 6 in said hundreds-
wheel, which has become wound during the forward movement of said wheel.
To the spring-brake 12, at a point between the stop-pin 22 and the point where the
arm 10 of the shaft 8 crosses said spring-brake, is attached or connected a vertical
rod 70, which carries at its upper end a key 46, and between the lower side of said
key and the top of the case 63 is arranged a coiled spring 60. To this key-
rod 70 is secured an arm 47, which extends outwardly from the rod 70, and when the
key 46 and rod 70 are depressed this arm 47 is thrown into the path of a pin or pro-
jection 44, rigidly secured to one of the arms or spokes of the primary adding-wheel 1
to arrest the motion of the latter as it is impelled forward by the prime moving
mechanism and when the indicator points to zero.
Within the periphery of the master-gear and the hundreds-wheel 3 are secured
springs 5 and 6, respectively, which tend to impel said gear and wheel in the
direction indicated by the arrows m for returning such wheels to their normal
positions.
On a sleeve 24', surrounding the shaft 24 of the primary adding-wheel 1, near the
floor 41, is rigidly secured a gear-wheel 27, which forms a part of the prime moving
mechanism, and said wheel 27 has an upturned rim 31, within which is fastened one
end of a motive spring 4, the other end of which motive spring is attached to the
frame of the tens-wheel 1. On the lower end of sleeve 241, below the floor 41, is
fastened a pinion 271, the cogs of which mesh with the teeth on a gear-wheel 28,
which is rigidly attached to an arbor 72, having its bearings in the floors 41 and 42
of the case or shell. Below the wheel 28, on the same shaft 72 to which the wheel 28
is secured, is a gear-wheel 28', which meshes with a gear-wheel 29, carried by an
arbor 73, journaled in the floors 41 and 42 of the case or shell. On the shaft 73,
below the wheel 29, is loosely attached a pinion 291, to which pinion is secured one
end of a spring. 30, the other end of which spring is secured to the frame of the
wheel 29. The pinion 29 meshes with a worm-screw 51" on the end of a shaft 51¹
50 that when the handle or crank 51 is rotated the pinion 29' is caused to rotate, and

page_text: thus wind the spring 30 around the shaft 73. The pinion 29¹ is kept from backward
movement after the spring has been wound by the engagement of the worn on the
shaft 51' with the teeth of the pinion 29¹.
The operation of my invention is as follows: By turning the crank or handle 51
the shaft 51 is turned, and in turn rotates the pinion 29', which winds up the
spring 30, and this causes the wheel 29 to rotate, and by means of the wheel 29,
pinion 281, the wheel 28 and pinion 27', and wheel 27 the spring 4 is wound,
the wheel being held in a fixed position by the stop 22 between two of its teeth.
When one of the keys 38 is depressed, its rod 34 is lowered, and the arm 34, which
bears on one of the arms 9 of the rock-shaft 8, causes the latter shaft to rock or turn,
and the arm 10 depresses the brake 12 and releases the stop 22 from the teeth of the
wheel 1, and at the same time the arm 11 lowers the master-gear 2 into engagement
with the primary adding-wheel 1. The spring 4 rotates the primary adding-wheel 1
and the master-gear 2 in the directions indicated by the arrows m until the stop 23
on the master-gear 2 comes in contact with the post 21, which is thrown up into the
path of said projection 23 by and connected to the same lever 32 as is the rod 34,
carrying the key on which pressure is exerted. The hand or pointer 52, secured
to the upper end of the shaft 24 of the primary adding-wheel 1, indicates on the
dial 55, which is directly over said primary adding-wheel 1, the number of teeth
which the primary wheel 1 has turned. Now, if the pressure exerted on key 38
is removed, the spring 37 returns the key and rod to their normal position, and this
action of said spring is aided by the coiled spring 14, which, as soon as pressure
is removed from arm 9 by reason of arm 35 being lifted, will cause the rock-; haft 8
to return to its normal position, and the stop 22 will return into engagement with the
teeth of the primary wheel 1, while at the same time the spring 61 will raise
the master-gear 2 out of engagement with the primary wheel 1. Should the number
of teeth turned by the master-gear 2 be greater than one hundred, which is the limit
of the number of cogs on the primary adding-wheel 1 and the numbers on the dial 54,
the stop or pin 26 on the under side of the frame of said primary adding-wheel I
causes the hundreds-wheel 3 to turn one notch at the time that the primary
adding-wheel 1 turns its complete revolution, and the pointer 53 secured to the upper
end of the shaft 25 of the hundreds-wheel indicates on the dial 54 the number
of complete revolutions made by the primary adding-wheel 1-in other words, the
hundreds added by the machine.
From the foregoing description, taken in connection with the drawings, it will be
observed that when one of the keys 38 is depressed the shaft 8 is rocked to cause the
arms 10 11 thereof to simultaneously depress the master-gear 2 into engagement with
the primary adding-wheel and to withdraw the spring-brake from engagement
with the primary adding-wheel, and simultaneously with this movement of parts the
key-lever 32 is actuated to raise the movable stop 21 into the path of the projection
on the master-gear. With the brake released from the primary adding-wheel
and the latter wheel and master-gear in engagement the two wheels are rotated
equally by the prime moving mechanism until the projection on the master-gear
comes in contact with the raised or lifted stop actuated by the pin, and as the
key is released the brake again engages the primary adding-wheel; but the rock-
shaft 8 lifts the arm 11 to allow the master-gear to be lifted by its spring 61, and
thus disengaged from the primary adding-wheel, so that the master-gear can be
returned to its normal position by its spring 5, or until the projection 23 thereon
comes against the stop-pin 20. As the primary adding-wheel is locked by the brake
in the position to which it was turned, its hand or pointer indicates on the dial the
amount added. The next key is depressed and the same action of parts takes place,
the primary wheel being moved to indicate the sum of the two figures thus added
together, and if the sum total of the two amounts thus added exceeds one hundred the
primary adding-wheel moves the hundreds-wheel one notch or tooth to indicate
such fact, and so on until the completion of the calculation, the two pointers indicating
on the dials the sum total or the whole amount thus added together.
In order to return the hand 52 on the primary adding-wheel 1 to zero, the key 46

page_text: is depressed, which releases the stop 22 from engagement with the teeth of the
primary wheel 1, and the motive spring 4 turns the primary wheel until the projection
or piu 44 on said wheel comes in contact with the horizontal arm 47 of the
key-rod 70, which brings the hand or pointer to zero, and the stop on the under side
of the primary wheel 1, which is at a point diametrically opposite to that at which
projection or pin 44 is secured, into its proper position. When pressure is removed
from the key 46, the spring-brake 12 and spring 60 return the key to its normal
position, and the brake 12 holds the primary wheel 1 against further movement.
To return the hand 53 of the hundreds-wheel to zero on the dial 54, the key 5) is
depressed, which causes the shaft 7 to turn or rock, and thus lowers the free end of
the arm 19, which depresses the hundreds-wheel 3 below the plane of the pawl 17.
The spring 6, which has become wound during the forward revolution of the
hundreds-wheel, causes the latter to rotate in the direction indicated by the arrow m
until the pin 43 on one of the arms of the hundreds-wheel 3 comes into contact
with the fixed stop 48. As pressure is removed from the key 50, the spring 15
returns the shaft 7 and the arm 19 to their normal positions, and the hundreds-wheel 3
is raised by the pressure of the spring 59, so that it is in position for use again in
connection with the primary adding-wheel.
I am aware that changes in the form and proportion of parts and details of
construction can be made without departing from the spirit or sacrificing the
advantages of my invention, and I would therefore have it understood that I reserve
the right to make such modifications and changes as fall within 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. In an adding-machine, the combination of a primary adding-wheel, a prime
moving mechanism, substantially as described, connected with said primary adding-
wheel for moving the same in one direction, a master-gear normally free from
engagement with the primary adding-wheel, a series of keys, a series of stops, each
actuated by one of the keys and adapted to be thrown into the path of the master-gear
to arrest the motion of said master-gear and primary adding-wheel, and a brake for
holding the primary wheel stationary after the master-gear is disengaged therefrom,
substantially as described, for the purpose set forth.
2. In an adding-machine, the combination of a primary adding-wheel, a prime
moving mechanism, substantially as described, for impelling said wheel in one
direction, a master-gear, a series of keys, a series of stops actuated by said keys,
each adapted to be thrown by its key into the path of the master-gear, a brake for
holding the primary wheel stationary after the master-gear is disengaged therefrom,
a device, substantially as described, actuated by depression of either of the keys to
move the master-gear into engagement with the primary wheel, and a spring
for returning the master-gear to its normal position after its disengagement from the
primary adding-wheel, substantially as described, for the purpose set forth.
3. In an adding-machine, the combination of a primary adding-wheel, a master-
gear normally free from engagement with the primary wheel, braking mechanism for
arresting the motion of the primary wheel on its axis, a prime moving mechanism,
substantially as described, for impelling the primary wheel in one direction when
released from its braking mechanism, a hundreds-wheel adapted to be turned
by the primary wheel at suitable intervals, a series of keys, and connections
intermediate of either of the keys, and the master-gear and braking mechanism,
whereby the braking mechanism is released from the primary wheel simultaneously
with the engagement of the master-gear with said primary wheel, substantially as
described.
4. In an adding-machine, the combination of a primary adding-wheel, a master-
gear normally free from engagement with said primary wheel, a series of keys, a
series of key-levers connected with the keys and each having a stop which is adapted

page_text: to be projected into the path of a pin or projection on the master-gear and a rock-
shaft actuated by the key and having means for depressing the master-gear into
engagement with the primary wheel at the same time that the stop on the key-lever
is projected into the path of the projection on the master-gear, substantially as
described, for the purpose set forth.
5. In an adding-machine, the combination of a primary adding-wheel, a master-
gear having a pin or projection, a series of vertically-movable stops arranged in
concentric rows around the master-gear and normally lying below the plane of the
same, a series of keys, each having a rod, and a series of levers intermediate of.
the key-rods and the stops to move the latter when said key-rols are depressed,
substantially as described.
6. In an adding-machine, the combination of a primary adding-wheel, a master-
gear having a p'n or projection and normally free from engagement with the
primary wheel, a series of vertically-movable stops arranged in concentric rows
around the master-gear and normally lying below the same or the projection thereon,
a series of key-levers for moving the stops vertically into the path of the projection
on the master-gear, a rock-shaft having an arm which acts to throw the master-gear
into engagement with the primary wheel, and a series of keys, each of which is
connected to one of the key-levers and has devices for rocking the shaft when said
key-rod is depressed, substantially as described.
7. In an adding-machine, the combination of a primary adding-wheel, a prime
moving mechanism for impelling the same in one direction, a spring-brake having a
pin which fits between the teeth on the primary adding-wheel to normally arrest the
motion of the same, a master-gear normally free from engagement with the primary
wheel, a series of keys, and devices intermediate of the keys, the master-gear, and
the spring-brake to release the brake from the primary wheel when the master-gear
is engaged therewith, substantially as described.
8. In an adding-machine, the combination of a primary adding-wheel, a prime
moving mechanism for impelling the primary wheel in one direction, braking
mechanism which normally engages the primary wheel to arrest the motion thereof, a
master-gear normally free from engagement with the primary wheel, and having
a retracting-spring contained within itself to return the same to its normal position,
and a projection or stop at its edge, a series of vertically-movable stops adapted to be
thrown into the path of the projection on the master-gear, a series of keys, and
connections intermediate of the keys, the master-gear, and the braking mechanism,
whereby the braking mechanism is engaged with the primary wheel when the
master-gear is thrown out of engagement with said wheel to be returned to its
normal position by the spring within the same, as and for the purpose described.
9. In an adding-machine, the combination of a primary adding-wheel, a spring-
brake for normally arresting said primary wheel, an independent key for releasing the
brake from the primary wheel, a prime moving mechanism for impelling said primary
wheel until arrested at zero by a stop, a spring-controlled hundreds-wheel arranged
to be moved by the primary wheel at suitable intervals, a separate key connected
through devices with the hundreds-wheel to enable the latter to be returned to the
normal position by its spring, a series of keys, a master-gear, and mechanism
for throwing the master-gear into engagement with the primary wheel and
withdrawing the spring-brake from said wheel, as and for the purpose described.
10. In an adding-machine, the combination of a primary adding-wheel, the keys,
a master-gear, devices intermediate of the keys and master-gear to depress the
master-gear into engagement with the primary wheel, a brake for arresting the
motion of the primary wheel, an independent key for releasing the brake from
the primary wheel, a spring for returning the primary wheel to its normal position,
and a stop for arresting the motion of the primary wheel when its indicator points to
zero, substantially as described.
11. In an adding-machine, the combination of a primary adding-wheel, the keys,
a master-gear, devices for actuating the master-gear on depression of either of
the keys, a prime moving mechanism engaging with the primary wheel, a brake -

page_text: for arresting the motion of the primary wheel, a spring-controlled independent key
adapted to be engaged with the brake to release the latter from the primary wheel,
an arm on the primary wheel, and a stop for arresting the motion of said
primary wheel when its indicator points to zero, substantially as described.
12. In an adding-machine, the combination, with a primary adding-wheel and
means, substantially as described, for actuating the same, of a hundreds-wheel
arranged to be moved at suitable intervals by the primary wheel, a pawl for
arresting the hundreds-wheel, an independent key for depressing the hundreds-wheel
out of engagement with the pawl thereof, and a spring for returning the hundreds-
wheel to its normal position, substantially as described.
13. In an adding-machine, the combination, with a primary adding-wheel, of a
hundreds-wheel arranged to be moved at suitable intervals by the primary wheel, a
spring connected to the hundreds-wheel, a check-pawl, which prevents the hundreds-
wheel from retrograde movement under the influence of its spring, a rock-shaft
having an arm which is connected with the arbor of the hundreds-wheel, an
independent key having a rod connected to the arm of the rock-shaft, and a spring
which bears against the arbor of the hundreds-wheel to return the same to its
normal position, for the purpose described.
Dated this 22nd day of October 1890
F. W. BARKER,
Applicant's Agent.

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