US334419A - dusceanek - Google Patents

Description

(Model.) 6 Sheets-Sheet l. K. DUSOHANEK.

CALUULATING MACHINE.

No. 334,419. Patented Jan. 19, 1886.

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Patented Jan. 19, 1886.

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(Model.)

K. DUSCHANEK. GALGULATING MACHINE.

Patented Jan. 19, 1886. 152.9

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K. DUSCHANEK.

GALCULATING MACHINE.

No. 334,419. Patented Jan. 19, 1886.

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K. DUSGHANEK. GALGULATING MACHINE.

NCL 334,419. Patented Jan. 19, 1886.

6 Sheets-Sheet 6. K. DUSGHANEK.

OALGULATING MACHINE.

Patepted Jan. 19, 1886.

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`UNITED STATES PATENT Ormea.

KARL DUSCHANEK, OF FREIBURG, GERMANY.

CALCULATlNG-IVIACHINE.

SPECF-CaTIUN forming'part of Letters Patent No. 334,419, dated January 19, 1886.

Application filed October 8, 1883. Serial No. 108,451.

To tZZ whom, it may concern:

Be it known that I, KARL DUscHANEK, of Freiburg. in the Empire of Germany, have invented new and useful Improvements in Galculatiiig-Machines, (for which I have applied for provisional protection in GreatBritain on the Lith day of August, 1883, No. 3,828,) of which the following` is a specification, reference being had to the accompanying drawings.

This invention relates to apparatus for mechanically performing arithmetical calculations, and can be used for adding, subtracting, and multiplying figures of any desired magnitude with the greatest ease and facility and in the most accurate manner.

The invention consists in the construction and combination of devices hereinafter more' fully described, claims.

In the drawings, Figure 1 is a side elevation of a machine constructed according to my invention. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation of the movable portion ot' the machine from the side facing the stationary part of the machine. Fig. 4 is a horizontal section ot' the machine with parts ofthe mechanism removed. Fig. 5 is an elevation or end View, partly in section, looking toward the right ot' Fig. 2. Fig. 6 is another horizontal section with parts of the mechanism removed. Fig. 7 is a detail view of part ofthe mechanism. Fig. 8 shows two portions of mechanism for arresting some of the numbered disks. Fig. 9 is a plan and elevation of mechanism which may be used in lieu of toothed wheels. Figs. 10, 10, and 11, and 11a show in plan and elevation different positions ofthe device for holding the drums in a raised position. Fig. 12 shows the position of the parts when the movable portion of the ma' chine is shifted from the position seen more fully in Fig. 6. Fig. 13 is a detail view of the toothed section and intermeshing spur-wheel and lifting-rack. Fig. 13a is asection of Fig. 13, showing also the relative arrangement of some of the number-wheels. Fig. 14 is a detail view showing a stem of a number wheel visible through an opening in the top plate of the machine. Fig. 14 is a detail view ofthe means for holding and releasing the toothed section. Fig. 15 is aface view of said toothed section.

and then set forth in the (Model.) Patented in England August 4, 1383, No 3,828.

The improved machine comprises two main parts, one of which is fixed, and carries the primary set of number-wheels and the other is movable and carries the secondary set of nu mber-Wheels As shown in Figs. 1, 6, and 12, the plate a forms the base or foundation ofthe entire ma chine, and above one half of this plate is arlanged a top plate, b,which is connected with the base-plate a by means of vertical columns or parts b, as is clearly seen in Fig. 1. These two plates form the bearings for the various shafts of the fixed portions of the machine.

On the top plate b is placed a fare-plate, c, upon which are engraved or otherwise shown marks necessary for guiding the operator in the manipulation of the machine.

In rear ofthe plate c of the fixed part of the machine is arranged a plate, d, lying in the same plane as said plate c, and mounted upon a longitudinally-movable frame or carriage constituting the movable part of the machine, as will be hereinafter more fully described. This frame or carriage consists, essentially, of a bottom plate, d, and vertical parts dwhich latter support the top plate d, and the entire carriage supports the shafts of the numberwheels and hand-cranks, as will be hereinafter set forth.

In referring to the Figsl, 5, 6, and 12, more particularly, the letters e e indicate vertical shaftsmpon which are mounted toothed sectors f f, the teeth y g of which are so disposed on the curved face of the sector that the bottom series of teeth will present a spurred segment of nine teeth, the next series of teeth a spurred segment of eight teeth, and so on,diminishing in number to the top,where only one tooth is formed, as is clearly seen in Fig. 15. These sectors f are movable vertically upon their shafts e, and are also capable of rotating with the latter by Virtue of a spline-and-feather connection.

In the plates a and c are journaled vertical shafts 7i h, the upper ends of which terminate in handles or knobs h2 for turning the same. These shafts carry bevel spur-wheels z', which engage with the bevel spur-wheels i8, mounted on short horizontal shafts t9, journaled in arms im, rising from the base-plate a. The shafts t also carry toothed wheels i', which engage with vertical rack-bars #,having arms extending obliquely therefrom, as is seen in Fig. 4.

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These arms, lying in two planes, as is shown in Fig. 1, are united into one frame by the vertical rods t, and they have furcated ends t, which straddle the shafts e on which the sectors slide up and down at points above and below said sectors-in other words, the arms i, rod t, and rack-bars t2 constitute a frame for shifting the sector when said frame is moved, by turning the shaft h and the intermediate gearing. 'Ihe arms 3 of the'sectorshifting frame are also guided in their up and down movements by the vertical guide-rods m', which are secured to the top and bottom plates ofthe frame, a shaft, m5, replacing one 'of these rods in the right-hand sector-shifting frame.

Each of the shafts h employed'forshifting the sectors carries a ratchet-wheel, k, of ten teeth, into which meshes ahorizontal pawl or detent lever, k3, mounted upon a vertical shaft, k, and acted upon by a spring, k2, upon the base-plate of the machine,which holds the pawl-lever in contact with the ratchetwheel and locks the latter. The object of these contrivances is to hold the sectors in an elevated position until such time as the pawland-ratchet mechanism is disengaged.

Upon the shafts h are mounted disks Z, as is seen in Figs. 1, 2, and 14, each of which has marked upon it the nine digits and the cipher. These disks or wheels Zmay be termed causa'- tion 7 disks or wheels since they are theinitial devices concerned in the performance of all kinds of arithmetical operations-viz., additions, subtractions, multiplications, and divisions.

In theplates b and c, whichlie closetogether,

apertures Z are formed, of such size as to show only one figure at a time upon each ofsaid causation-disks. The said apertures are situated between the shafts e of the sectors f.

The figures which appear through the above mentioned apertures are varied according to the position in which the toothed sectors have been set-that is to say, the said numbers indicate how many teeth of the sectors 7 are in position to gear with wheels o on the movable portion of the machine fora purpose hereinafter described. 1

In Fig. 13a is shown, by way of example, the position ofthe toothed sector (shown in section) when the fourth row of teeth from the top have engaged with the wheel o', land the numeral 4 on the disk Z of the shaft h is supposed to be visible through the aperture in the top plates b c, the other numerals being concealed beneath said plates.

The mechanism hereinbefore .described serves to arrange the multiplicand or divisor, and'hence there are provided as many sectors fand number-disks Z as there are gures required in the said multiplicand or divisor.

The apparatus shown in the drawings is arranged for two gu'res only.

In order to bring the sectors to their normal positions and return the disksl to the zero; point alter a calculation has been'made, de-

vices shown in Figs. 1 to 6, inclusive, are employed. They consist of a shaft, m5, stepped in the top and bottom plates, a b, and surmounted by a crank orV handle, m, and also bearing a toothed wheel, m2, at the bottom, which, through the medium of a train of gearing,m2,operates as many shafts m4 as there are sectors f. The spur-wheels m3 are on the shafts m4 and mi sh into the wheel' on shaft m5, so that by turning the latter, through the medium of the handle m all the shafts m-4 will be turned. Each shaft m4, carries a cam, m1, (seen more fully in Fig. 6,) upon which cams bear the end projections or hooks, k, on the pawl-levers k, so that when the said cams m1 by their rotation vibrate the pawl-levers the ratchet-wheels k are released from the said pawls, whereby the weight of the sectors f sliding downward on the shaftsewill, through the medium of the arms i3, racks i2, and gearing t" and t', rotate the shafts h, and return the number-disks thereon to the zero-point, as has already been explained.

In order to prevent the sectors from falling too suddenly when the ratchets are released from the pawl-levers, the shafts m4 carry partially toothed or mutilated wheels n, (seen in Figs.- 6 and 142) which, when the ratchets are released, engage with the correspondinglytoothed wheels n upon the shafts h, and thus act as a retarding medium, since it is evident that the intel-meshing gear-wheels of the respective shafts will accomplish the desired result. The toothed wheel n has a toothless space, n, so 'disposed between two of its teeth that said space will come opposite the teeth of the toothed wheel u when the disk lis brought to the zeropoint. It is evident that as soon as the toothed wheels n have caused the wheels n to move far enough for the space between IOO their teeth to come opposite the teeth ofthe former the'wheels nv 'n' pass out of gear, and the disks Z are placed at zero, as has already been stated.

The cams m10 on the shafts m4 act in such a manner that all the various parts of the machine are not compelled to move in the same time; but this arrangement is not absolutely necessary. ItA should be observed that if the shafts m5 and m4 are caused to perform awhole revolution by the devices above referred tu all the pawl-levers k3 will be released, and the sectors dropped to their normal positions, and the disks set at zero.

Referring to Fig. 14 we may assume that it shows the position of the means for holding one of the sectors elevated to such a height as to reveal the figure 4 on the numbered disk through the aperture in the top plate, it being assumed that in this instance the wheel n on the cam-shaft m* has been rotated until the rst tooth in'gear with the fourth row of teeth is on the wheel n on the shaft h, bearing the numbered disk Z and ratchet-disk k. After a IIO further rotation of five teeth the wheel n, com,

ing to the untoothed portion n of the wheel n', is thrown ont of engagement with the latter,v

whereupon the corresponding disks Z are set at zero.

In order to prevent the crank m on the shaft m from turning to the left, a ratchetwheel, m3, is applied to one of the shafts m4, and a spring-pressed pawl, m10, is mounted on the base-plate a, so as to engage with said ratchet-wheel, as is clearly seen in Fig. 4.

The shafts o on the shifting part of the machine bear the toothed wheels o', as already stated, and also carry the numbered disks oz, which determine,in connection with the wheels r2, hereinafter referred to, the result of the a-ritlimetical operation brought into existence by the causationwheels l, and hence both said wheels or disks o2 and r2 may be termed the result wheels or disks. The shafts o of these wheels o2 are located opposite the toothed sectors f, and the toothed wheels o are placed at such a height relatively to the sectors that when the disks o2 are set at zero the sectors are in their lowermost positions and not in gear with the toothed wheels o.

The plate d, constituting the top of th movable part of the machine, has as many apertures oi as there are numbered disks 02 mounted on the shafts o. When the disks Z, bearing either the multiplicand or divisor numbers, are rotated so that the numbers l 2 3 show through the apertures the corresponding sectors are raised proportionately, and by a single revolution of said sectors a similar number of teeth, g, of the same are placed in gear with the toothed wheels o', as is shown in Fig. 13. Thereupon, by a further rotation, the sectors cause the toothed wheels o to rotate for a distance of four teeth, and the number four on a disk, o2, conse quently becomes visible at an aperture, o, in'

the top plate d of the movable part of the machine. The rotation of the sectors is effected by means of a crank, p, attached to the upper end of a shaft, p', which is journaled in the plates c and b of the stationary portion of the machine. This shaft p has a spur-wheel, p2, which actuates the train of gearing p, p4, p5, p, pl, p5, p, p10, p, and p. At each revolution to the right of the crank p the number appearing,l` in the apertures Z is added to the number on the disks of, appearing in the apertures 03,audthissamenumbershownthrough the apertures Z/ is consequently multiplied by the numbei'of revolutions of thesaid crank p. Then the crank is turned to the left instead of to the right, at each revolution ofthe same the number appearing in the apertures Z is subtracted from the number appearing in the apertures o3. Additions and inu-ltiplications are therefore effected by revolutions of the said crank p to the right, and subtractions and divisions of revolutions of the same to the left. As soon as disk o2 has effected a complete revolution, through the medium of the spur-wheel o and corresponding sector, and the number 9 is visible at its aperture of, the following ten or hundred must be added by the mechanism shown more fully in Figs. l,

3, 5, 7, l0, and l1, and of the following nature:

On the shaft o of the disk o2 is fixed a pin, of, which in its revolution raises a lever, o5, that is fulcrumed by or hung on a rod, o, fitted in brackets ol, rising from the plate d', as is seen in Figs. 5 and 7. This lever has a projection, o, on its under side, which is engaged by the pin 01 as the shaft 0 is rotated, whereby the lever is raised as already stated.

In order to prevent the lever from falling below its horizontal position, a projection, o, is located on the lever at its fulcrunrpoint and bears against a pin, om, as is seen in Figs. 5 and 7.

Upon some of the shafts e of the sectorsf,

and upon a shalt, l, revolving at the same time as the said sectors, are mounted the drums o, each of which has two horizontal arms, oT and o5, as is seen in Fig. 6. Vhen the shafts o and their numbered disks o2 have accomplished a revolution, the lever 0 and the corresponding drum, o, are raised bythe arm o'L on shaft o, and remain in this'position until the shafts e and c0 have accomplished their revolution. The said drum engages, by means ofeither of its arms, with the wheel o, placed above the toothed wheel 0, and moves the same one step forward, and thus causes the movement of the next disk when a preceding numbered disk has made a complete revolution.

For the purpose of holding the drum oG in a raised position during the revolution of the shafts @and c, Iprovide devices. (Shown more fully in Figs. l0, l0, ll, and ll, in which is shown a lever, q', acting directly upon the drum o, and a spring for lowering said lever subsequentto the raising ofthe drum.) Neither the lever q nor the spring q are n'Xed to the frame of the machine, but are mounted upon a plate oi piece, (jl, which is secured to a rod, Q3, that is fitted in the vertical bearing-pieces qt, secured to the top and bottom plates, a b. The to-and-fro movement of the plate qt is effected by means of eccentrics tf and (J`,which are mounted on a shaft, Q10, stepped in the top and bottom plates ofthe machine, and arranged as is shown in Figs. ll and ll. The shaft q1 carries a sp u r-wheel, p, which receives motion from the sector-operating mechanism. The eccentrics Q and Q are of different sizes, and they operate between studs or rods (j and (f, depending from the sliding plate Q, and in order that they may alternately engage with said studs to move the plate to and fro the studs themselves are made of different lengths, as is clearly seen in Figs. l() and ll. The pin or stud q on the top of the plate q2 strikes against the projection q1* on the lever gj', and allows only sufficient play to the spring bearing upon said lever for depressing the latter to the position shown in Fig. 10 below the drum, which depression allows the said lever to fall and again to rise when the next tcn is to be added.

For subtractions an'd divisions, the arrangeent for the tens and hundreds disks is eX- IOO IIO

IIS

actly reversed, the disks being returned to zero by means of the arms o8.

In the above-described operation the sectors f are always in gear with the toothed wheels o which are in front of them, and the multiwith the third wheel o', a similar arrange-- ment being extended to the other sectors. This connection is effected by mounting the shafts o,with their bearings and disks and devices actuated thereby,upona part of the machine which can be moved to the right or to the left in relation to the xed part of the machine. The construction of this movable part or carriage is specially illustrated in Figs. 3, 5, and l2.

The plates d d, which carry the several parts of the machine, are connected by means of hangers d with longitudinal rods d3, which slide in bearing-holes of upright plates a fixed upon the foundation-plate a. As the position ofthe said carriage must be fixed for the various positions of the units and the tens -so that the wheels o shall come precisely opposite the sectors, two notches, a2 a2, (seen in Figs. 4, 6, and 12,) are formed in the base-plate for the reception of a locking arm or pawl, d4. This pawl or arm is fixed upon a rock-shaft, d5, which rotates in bearings in the hangers d2, and basa lever-arm, d?, projecting therefrom and acted upon by a verticalpush-rod, di, which is encircled by aspiral spring, dm. By operating the push-rod the pawl d4 is withdrawn from either of the notches in the foundation-plate to allow the movable carriage to be shifted, the spring at other times holding the parts in a locked position. The push-rod d consists of two parts firmly attached together, the left part pressing upon the leverarm d", as is s'ecn in Fig. 7. It is therefore only necessary in order to move the carriage toward the next ten to raise lthe pawl d4 by means of the push-rod d, and draw the carriage in a longitudinal direction, when the pawl after the carriage has reached the desired position will fall automatically into the notch in the base-plate opposite said pawl and lock the carriage in its new position.

It is obvious that as many notches a2 will be required as there are numbers in the multiplier or quotient.

In order to be able to perceive at the end of a multiplication how many revolutions of the crankv have been accomplished to bring the units, tens, or other numbers int-o position, the shafts r are arranged upon the carriage above mentioned, and upon them are mounted Y the toothed wheels r, each provided with ten teeth and the disks or wheels r2, heretofore specified under the name of result wheels or disks. rIhe upper plate, d, of the machin-e is provided with corresponding apertures, r3, to

show the numbers on the result-wheels r2. The shaft r5, which is journaled in the plate a and in a bracket rising from thelatter, is provided with the pin r6, which is in gear with the toothed Wheel r', and will rotate by means of the gearing of all the Wheels p2 to p12 with the crank p. In this rotation the toothed wheel r', in gear with the wheel mounted upon the shaft r, is rotated one tooth farther. Vhen the carriage isin its first position-that is to say, when operations are performed with the* units only-the pin rf; enters the teeth of the last wheel r to the right. Vhen a multiplication is effected with the tens, the carriage is brought into its second position, which causes the pin r6 to enter the teeth ofthe second wheel r', and a similar' arrangement will correspond to the use of further numbers. The direction in which the shaft T5 and the shafts of the disks r2 rotate is the reverse of that in which the crank p revolves. The multiplication has therefore to be arranged upon the disks, and when a revolution of the crank p is eifected in the right direction all the numbers are placed at zero in the apertures r3. For divisions, the revolution'of the crank will be effected in a reverse direction, the numbers of the above-mentioned disks being thus placed at zero, and the quotient will appear as the result of the operation in the apertures r3. All the disks have grooves or indentations formed in their peripheries, into which indentations the spring-tongues o9 and rl, (seen in Fig. 2,) fall as soon as a number appears at one of the apertures. As by the sudden turning of the crank a number may easily be passed over, the arrangement shown in Fig. 8 is resorted to in order to avoid such an occurrence. In this arrangement the spring rl lits into the concave indentations of the disks r11, and a fork, rs, turning upon thestud or fulcrum r, .has one of its prongs provided with a pointed projection, r1", while the other prong terminates in a projection, r, of the same shape as the con# cave indentations in the disk. At each rotation of the latter the distance of one indentation an oscillating movement is imparted to the fork, and at the moment when the rotation of the disk is lto be arrested the mounted projection ofthe fork passes into the indentation of the disk and holds the latter stationary. The fork is easily released from the disk by exerting the proper force to turn the disk.

lThe disks o2 and r2 are set at zero as fol- IOO lows, viz; The shafts of the said disks o2 and crank s in the zero position, its shaft carries a disk-segment, si), upon the flat portion of which bears a spring, sw, as is seen in Fig. 2. rlhe toothed wheels which transmit the rotation, and which are mounted upon the shafts s s3 up to se, are for the sake of clearness not shown in Fig. G. The position of their shafts, however, is indicated by the black circles. A single revolution of the crank s is sufficent to place the product and multiplier upon zero, and at the same time every disk controlled by the action of the crank s is placed at zero and thrown out of gear, which is the case when the rotation ofthe shafts of the wheelssZ brings the parts of the wheels s' from which the tooth is missing opposite the wheels 82.

In the calculation of proportions, it is necessary that the row of gures appearing in the apertures 03 and r3 should not be placed at zero at the same time by a revolution of the crank s. It is therefore necessary that the toothed wheel mounted upon the shaft of the crank s should have room on its periphery for thirty-six teeth, but only have nine teeth, the remaining space being left vacant. By half a revolution of the crank s the row of figures in the apertures os is placed at zero, and by another halfrevolutlon of the said crank the row of figures in the apertures r3 is likewise placed up to zero.

The various calculations are effected in the following manner, viz:

For addition, the number which is to be added to a number placed in the apertures o3 is shown in the apertures Z. The crank p is then turned once round to the right, when the said. number is added to that which was in the apertures 03.

For subtraction, the number which is to be subtracted from a number shown in the apertures o" is shown in the apertures Z. The crank is then turned once round to the left, and the result of the operation is shown in the apertures 03.

For multiplication, one of the factors is shown in the apertures Z and the other in the apertures r3, the carriage d cZ being in its normal position. The crank p is then rotated to the right until zero appears in the aperture r3, whereupon the multiplication of units is accomplished. The carriage (Z CZ is then pushed to the right until the pawl cZ falls in the notch a2, the crank p being revolved to the right until the figure 0 appears in the second aperture r3. rlhis operation is continued in a similar manner for greater numbers. The product is seen in the apertures 03.

For division, the operation is performed in an exactly reverse manner to that above described. The dividend is shown in the aperertures o3 and the divisor in the apertures Z', whereas the number in the apertures r3 is left at zero. rIhe carriage is then pushed to the right, and the winch-crank is rotated to the left. If the number 9 appears on the left in the apertures, it shows that the said carriage is moved too much to the right. The crank p is then turned one revolution backward, the carriage is pushed back to its next position, andV the crank is turned on again to the left until the figure 9 appears, when the crank is turned back again to the right, as before. The rest of the operation is repeated as above until zero appears in the row of apertures o3, or a smaller number than the division, which is in this case the rest of the division, whereas the quotient appears in the apertures r3.

I claiml. In a calculatingmachine or arithmometer capable of performing the operations of addition, subtraction, multiplication, and division, the combination of a rotary shaft, a toothed sector capable of sliding upon and rotating with said shaft, and means for vertically moving, holding, and releasing said sector, with a causation-disk set by said toothed sector and a result-disk rotated or actuated by said toothed sector, substantially as described.

2. In a calculatingmachine or arithmometer, the combination of a series of rotary shafts, a corresponding number of toothed sectors capable of rotating with and sliding upon said shafts, means for sliding, locking, and releasing said sectors, numbered causation-disks applied to the shafts of the toothed sectors, and result-wheels rotated or actuated by said toothed sectors, substantially as herein set forth.

3. In a calculating-machine, the combination of a sector having nine teeth of unequal length on its curved face, the rotary shaft carrying said sector, a rack-bar and arms, and pinion-shaft for raising and lowering said sector on its shaft, with a causation-wheel set by the sector and a result-wheel acted upon by the same, substantially as herein set forth.

4. In a calculating-machine, the combination of the train of gearing, the shafts of the causation-disks, the toothed sectors and their shafts, and means for vertically moving and rotating the sectors, with the result-disks operated by the sectors, substantially as herein Set forth.

5. In a calculating-machine7 the combina` tion of the rotary shaft, the toothed sector fitted to turn therewith and slide thereon, and means for vertically moving the sector7 with the shaft h, carrying the causation-disk Z, and ratchet-wheel 7c, the shaft mt, having the cam m10, and the pawl-lever k3, substantially as herein set forth.

6. In a calculating-machine, the combination of the ratchet-wheeler?, spring-pawl m20, shaft m4, shaft m5, geared to said shaft m4, and crank m, with the toothed sector, its rotary shaft, and the causation and result disks, substantially as herein set forth.

7. In a calculating-machine, the combination of a motor-shaft,p, having a crank-arm, p, a train of gearing, and the toothed sectors, with their rotary shafts, adapted to be moved to the right or left by said crank, substantially as herein set forth.

8. In a calculating-machine, the combina- IOO IIO

tion of the shafts having disks, on which the result of an arithmetical operation is shown, and wheels possessing ten teeth, with the toothed sectors arranged opposite said toothed wheels and means for causing the sectors to engage Withsaid wheels or be released therelfrom, substantially as herein set forth.

9. In a calculating-machine, the combination of the drums provided with two arms, the levers, and the shafts having pins, andan adjacent shaft having a toothed wheel and numbered disk, said levers acting upon the drums to raise them to such a height that one of the arms thereon engages with the toothed wheel of the adjacent shaft and turns the same to show the next figure, substantially as herein set forth. A v

10. In a calculatingmachine, the combination of the levers 7, and the springs q, acting upon the saine, with the movable drums vo, having arms o7 o8, the shafts of said drums, the causation and result wheels, and means for operating the same, substantially as herein set forth.

11. In a calculating-machine, the combination of the movable or sliding piece or plate q2, the spring-pressed levers mounted thereon, the eccentrics for giving a to and-fro movenient to the sliding piece, with the toothed section, with the stationary main frame having a notched base and carrying rotating sectors, causation-disks, and operating-gearing, of the carriage or shiftable frame having numbered disks for indicating the result of arithmetical operations, and with detent or locking mechanism engaging with the notched base of the stationary frame, substantially as herein set forth.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

nKARL DUscHANEK.

Witnesses:

F. ENGLERT, FRANZ MLLER.

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