Historical Document · 1931
US Patent 1,829,379: Computing Machine (A. E. Vethe, the Addometer)
Vethe's computing-machine patent, filed in Oslo on 20 October 1926 and granted 27 October 1931.
Historical Document · 1931
Vethe's computing-machine patent, filed in Oslo on 20 October 1926 and granted 27 October 1931.
Oct. 27, 1931. A. VETHE 1,829,379 COMPUTING MACHINE Filed Oct. 20, 1926 2. Sheets-Sheet aly aZA. Oct. 27, 1931. A. WETHE 1,829,379 COMPUT ING MAC NE Filed Oct. 20, 926 2 Sheets-Sheet. 2 Wvaayrae : Ay, 1:66. (A9. Patented Oct. 27, 1931 1,829,379 UNITED STATES PATENT OFFICE ANDERs vFTHE, OF OSLO, NORw AY COMPUTING MACHINE Application filed October 20, 1926. Serial No. 142,953. This invention relates to computing ma in a series and the actuating wheels with the counter-wheels, The object of the invention is to provide Fig. 6 is a view substantially similar to a computing machine adapted for effecting Es 1 illustrating a modified construction, both addition and subtraction, which is of simple and relatively inexpensive construc Fig. 7 is a sectional elevation taken sub tion, of strong and durable construction, and stantially on the line 7-7 of Fig. 6. Describing the invention, in the first in is effective and reliable in operation. To effect the objects of the invention, my stance, with particular reference to Figures () improved computing machine comprises a 1 to 5 of the drawings, in which I have shown 60 frame, shafts mounted therein, a plurality what I now consider to be the preferable em of counter-wheels, actuating wheels mounted bodiment of the invention. to turn on said shafts, respectively, said ac The operative parts of the machine are tuating wheels comprising marginal lugs for mounted on a suitable frame consisting of a turning the same, gearing rendered operative base plate 1 and end plates 2, 2’, rigidly se by the lugs on said actuating wheels when cured thereto. Said base plate and end rotated, which connects said counter-wheels plates are preferably made of suitable sheet in series and each actuating wheel with a metal, as sheet steel, and may conveniently counter-wheel, said counter-wheels having be formed by usual stamping processes. numerals on their perimeters, a casing which Supported in the end plates 2, 2’, and encloses operative parts of the machine pro preferably securd thereto against rotation vided with sight openings through which are shafts 3 and 4, both of which are provided the numerals on different counter-wheels, re with shoulders at their opposite ends and are spectively, are exposed in operation, means held against rotation by clamping them be for yieldingly holding said counter-wheels tween said end plates. Simple means for 75 and actuating wheels against rotation when this purpose consist of nuts 5 threaded to the in positions corresponding to exposure of nu ends of the shaft 3 outside of said end plates, merals on said counter-wheels through their which provide for clamping said frame plates associated sight openings, respectively, and in firm engagement with shoulders formed on 80 means for resetting said counter-wheels foll said shaft. Mounted on the shaft 4 so as to turn freely lowing operation of the machine. The invention also comprises the various thereon are a plurality of counter-wheels 6, other features, combination of features and and mounted on the shaft 3 are a plurality what for purposes of convenient reference, details of construction hereinafter described of may be designated actuating wheels 7, said and claimed. In the accompanying drawings in which counter-wheels and actuating wheels, respec tively, being facsimiles of one another. my invention is fully illustrated: Fig. 1 is a front view of the machine with A description of one of said counter a section of the casing broken away to expose wheels and one of said actuating wheels will, 90 40 operative parts thereof, therefore, suffice for all and the accompany Fig. 2 is a sectional view of the machine on ing description will, therefore, be in the singular. the line 2-2 of Fig. 1, Fig. 3 is a fragmentary sectional side view As shown, the counter-wheels 6 are stamped from suitable sheet metal, prefer on the line 3-3 of Fig. 1, Fig. 4 is a detached view showing the ably aluminum, so as to form a cylindrical 95 counter-wheels and operating gearing there portion 8, provided with a web portion 9, for partly in elevation and partly in section which is provided at its center with an open ing in which is secured a hub portion 10 and on the line 4-4 of Fig. 2, Fig. 5 is a fragmentary side view of the provided with an axial opening adapted to OO gearing which connects the counter-wheels receive the shaft 4. chines. 2 1829,879 Formed on the cylindrical surface of said 23 secured to the hub 10 of the counter-wheel counter-wheels and arranged in uniformly 6, said star wheel consisting of radiating spaced relation thereon are numerals ar spokes or fingers which project into the path ranged in series from zero to nine, the rela of movement of the teeth of the star wheel 5 tion being such that by turning the different 20. Thus, as the actuating wheel 7 is ro counter-wheels different numerals on dif tated in operation, the marginal projections ferent wheels may be brought into trans 16 hi will engage the teeth or notchess verse alignment. 21 or 22 in the pinion 19 and will impart In accordance with my invention, rotation rotation thereto and also to the sleeve 18 to 10 is adapted to be imparted to said counter which said pinion is secured and to the star wheels in either direction by means as fol wheel 20 secured to the opposite end of said lows:-The actuating wheels are mounted sleeve, rotation of said star wheel 20 oper on the shaft 3 so as to be separately rotatable ating, in turn, to impart rotation to the star thereon in both directions, the number of wheel 23 secured to the hub of the counter l6 said actuating wheels being equal to the wheel 6, whereby rotation will, in turn, be 80. number of counter-wheels 6. In order that imparted to said counter-wheel. said actuating wheels may be very light and lso secured to the hub of the counter will thus have very little momentum in op wheel 6 is a finger 24 which, at the critical eration, they are preferably stamped from point in every complete revolution of said 20 suitable sheet metal, as sheet steel, and are counter-wheel will engage a tooth or notch 85 skeletoned to form a rim portion 11 and 21 or 22 in the pinion 19 of the gear train spokes 12 which connect said rim portion high which rotation is adapted to be im with a central disk 13, said rim portion and parte to the counter-wheel of next higher spokes being made as light as consistent with denomination, for the usual carrying opera 25 necessary strength. tion by which said counter-wheel is moved 90 Formed in the central disk of said actu either forwardly or backwardly a distance ating wheel is a hole, secured in which is a equal to that between adjacent numerals hub 14, which is provided with a bore loose thereon. ly fitted to which is a bushing 15, which is Operative parts of the machine are en 30 slightly longer than the hub 14, thus provid closed in a suitable casing which comprises 93. ing necessary clearance to prevent binding of a cylindrical section 25, the outer surface said wheels when the machine is assembled of which is substantially flush with the pe and the clamping nuts 5 are tightened. riphery of the rim portions of the actuating Formed on the actuating wheels 7 are mar wheels 7, and front and back sections 26 and 35 ginal projections 16. The outer ends of said 27, which comprise portions 26 and 27' be 00 marginal projections 16 are flat, the sides low and above said cylindrical portion 25, thereof extending radially and being sub which extend substantially radially with ref stantially coincident, with planes passing erence to the axis of the shaft 3. Said por through the axis of the shaft 3. Said mar tions 26, 27, form stops with which the fin 40 ginal projections 16 are so proportioned that ger of the operator will contact in operating they may conveniently be engaged by a finger the machine, thus limiting rotation of the 105 of an operator to turn said wheels. actuating wheel 7 in operation. The counter-wheels 6 are connected is se Formed in the portion 27 of the casing ries, and said counter-wheels 6 and actuating section 27 are sight openings 28, there being 45 wheels 7 are connected in pairs by suitable a sight opening for each counter-wheel 6 and gearing, as follows:-Mounted in rigid parts the relation being such that, in positions of 10 of the frame of the machine is a shaft 17 rest of said counter-wheels, a numeral on each shown as substantially intermediate the thereof will be exposed. shafts 3 and 4, and which extends parallel An important feature of my improved com 50 therewith-rotatably mounted on which are puting machine is that the counter-wheels ils sleeves 18, secured to opposite ends of each 6, actuating wheels 7, and the gearing con of which is what may be described as a pin necting the same will operate equally well ion 19 and a star wheel 20, said pinion being both frontwards and backwards, thus adapt shown as provided with two sets of teeth ing the machine for performing subtraction 55 or notches 21 and 22, which are arranged al as well as addition. ternately. The arrangement is such that The actuating wheels 7, the bushings 18 upon rotation of the actuating wheels 7 in together with the pinions 19 and the star clockwise direction in Fig. 5 the teeth 22 are wheels 20-and also the star wheel 23, are engaged by the marginal projections 16 for adapted to be maintained yieldingly in posi 30 rotating the pinions, and that upon rotation tions of rest corresponding to register of a 25 of the actuating wheels 7 in counter-clock numeral on each of the counter-wheels with wise direction in said figure the teeth 21 the sight openings 28 associated therewith, are en raged by said projections 16 for driv respectively, by means of springs 29, 30, and ing the pinions in clockwise direction. Said :31, respectively, which are adapted to en 8 5 gearing also comprises a second star wheel gage adjacent marginal projections 16 on the 3. O d 1,829,379 3 actuating wheels 7, the outer ends of adjacent erating wheels 7 and the springs 29 from operation is correspondingly important. spokes or figures of the star wheel 23 secured such Another characteristic feature of my im to the counter-wheels and adjacent points of proved machine resides in the fact that all of the star wheel 20, the machine are constructed and O As shown the springs 29, 30, 31 are mount the parts of to function in both directions, thus ed on members 32 positioned between adja arranged cent counter-wheels 6 and actuating wheels providing for performing addition and sub on the machine, rotation of the actu 7 and which are provided with bearings traction adapted to receive the shafts 3 and 4 and also ating wheels 7 in one direction advancing O the shaft 17, said members 32 being clamped their associated counter-wheels, thereby in 75 creasing the total of the number represented in position between the bushings 15 on which by the numerals exposed through the sight the actuating wheels 7 are mounted. Said members 32 will operate in an ob openings 28, and rotation of said actuating wheels in the reverse direction, will reduce vious manner, to tie the shafts 3 and 4 to the number formed by the numerals exposed gether and to support the intermediate shaft 5 said sight openings 28. 17 independently of the end plates 2, 2’, through After a has been finished, the of the machine frame, ifspringing desired, and will machine iscomputation adapted to be reset so that the or buck characters also effectually prevent Zero on all of the counter-wheels ling of said shafts. 20 : As shown; the intermediate shaft 17 is sup will be exposed at the sight openings 28, thus 85 putting the machine in condition for a new ported entirely by the members 32, but may computation or calculation. also be provided with bearings in the end In accordance with my invention, this is frames of the machine, if desired. effected by means, follows:As shown, also, said members 32 afford Secured to the ashubs 10 of the counter 90 convenient means for supporting the casing wheels 6 are pinions 34, and rotatably mount section 25, which comprises a plurality of ed in the plates 2, 2’, of the machine separate parts positioned between adjacent frame is aend shaft 35 secured to rotate with actuating wheels 7 and which are propor which are segmental gears 36, the teeth of tioned to provide slots of suitable width to which are adapted to engage the teeth of the 95 30 receive the rim portions of said actuating pinions 34 when any numeral other than zero wheel. exposed at a sight opening associated with For convenience, numerals from 1 to 9, isa given counter-wheel. designated by the reference numeral 33, are The pinions 34 are made of a diameter cor provided in association with the actuating responding to a number of teeth thereon equal 00 wheels 7, being preferably imprinted in any to the number on the counter suitable manner on different parts of the cas wheel, to wit: 10,ofanumerals tooth of each of said pin ing section 25 in such that they will ions being cut away and the pinions 34 and align transversely withpositions the marginal projec segmental gear 36 being made of such rela tions 16, when in positions of rest. diameters that, when the pinions 34 are 05 40 In order that adjacent counter-wheels of tivepositions corresponding to exposure of the higher denominations may be actuated by in characters Zero (0) at the sight openings means of the fingers 24 secured to the hubs of counter-wheels of next lower denomina 28, a right line passing through the axes tions without rotating the actuating wheel of said pinions 34 and segmental gears 38, 45 associated with such counter-wheels of high will pass substantially through the centers of 10 spaces formed by the cut-away teeth of er denominations, the extreme distances be the said pinions, respectively, and the teeth. of tween adjacent marginal projections 16 on said gears 36 will “escape' the the actuating wheels 7 and the diameters of teeth segmental of the pinions 34, but will engage the the pinions 19 are so proportioned, and the teeth of pinions when any numerals or 5 relative positions of said actuating wheels characterssaidother and pinions are such that, in positions of rest, said sight openings.than Zero are exposed at the marginal projections 16 will “escape' the when any counter-wheel is in posi teeth of the pinions 19, so that said pinions tionThus, corresponding to exposure of a numeral 20 19 will be free to rotate independently of said 5 5 rotating wheels. This is an important fea other than the character zero at a sight open and rotation is imparted to the shaft 35 ture of my improved computing machine, ing and to the segmental gears 36, rotation since it very materially reduces the strain on will thus be imparted to the pinion 34 associated the operating mechanism during a carrying with said counter-wheel, thereby turning said operation and particularly so when a number (50 of carrying operations are performed simul counter-wheel until the character zero is ex 25 posed at the sight opening, in which position taneously, as when 1 is to be added to a num the of the segmental gear 36 will pass ber ending in a series of 9's. In such case, out teeth engagement with the teeth of the pin the train of gearing to the last operated part ion of 35 and the counter-wheel will come to at the left as shown in Fig. 1 is compara tively long, so that the elimination of the op rest with the character Zero exposed at its ( 4 1,829,879 sight opening and the detent spring 30 in en on said actuating wheels providin gagement with the points of the star-wheel23. jections means for turning the same; 17, a gear shaft In accordance with my invention rotation ends of which are reduced, forming shoul is adapted to be imparted to the shaft 35 the ders thereon, the reduced ends thereof being S to reset the machine by means of a train of adapted to engage holes in the end plates 2,2', 70 gears comprising a segmental gear 37 (Fig. of the machine, being so proportioned that 3) rotatably mounted on the shaft 3 adjacent the clamping nuts 5 are tightened, the to the end plate 2 of the machine frame, a When shoulderson said shaft will be clamped be pinion 39 secured to the shaft 35 which car tween said end frame members and held 0. ries the segmental gears 36 and a gear 40 against rotation: 18, sleeves mounted to turn 75 rotatably mounted on a stud 41 secured in freely on the shaft 17 secured to opposite ends the endplate 2 and which intermeshes with of each of which, respectively, is a pinion 19 the teeth of the gears 37 and 39. and a star wheel 20, Rotation is adapted to be imparted to the Excepting as hereinafter particularly de 5 segmental gear 37 by means of a lever arm scribed and pointed, all of the foregoing parts. 80 42 secured thereto, the end of which projects are substantially similar to the same or corre through a slot 43 in the cylindrical portion sponding parts of the preferred embodiment 25 of the casing of the machine. In posi of my invention shown in Figs. 1 to 5 of the tion to be engaged by a finger of the opera drawings and heretofore described, and will 85 20 tor to exert a pull on the lever arm 42, the be readily understood therefrom without a ends of said slot forming stops, contact of description thereof in detail. said lever arm with which, limits turning the modified construction shown in Figs. movement of said segmental gear. The seg 6 In and 7, the counter-wheels are formed by mental gear 37 is maintained yieldingly in cylindrical flanges 50 formed on and which 90 25 position corresponding to full disengagement project laterally the rim portions of the of the segmental gear 36 from the pinion 34 actuating wheelsfrom 7, said flanges bearing on by a coiled spring 44 applied thereto, one end their outer cylindrical surfaces, a plurality of which is connected to the segmental gear of series of numerals from 0 to 9 arranged in 37 and the opposite end thereof to the adja uniformly spaced relation thereon, and the cent member 32, displacement of said sprin number of marginal projections on the dif 95 being prevented by coiling it about the hubg ferent actuating wheels being equal to the of said segmental gear 37. total number on each wheel, that During operation of the machine the seg is, the numberofofnumerals said marginal projections mental gears 36 are fully disengaged from being a multiple of 10. As shown, also, the 3.5 the pinions 34 in order that said gears 36 pinions 19 are secured to the right hand end 100 shall not interfere with free turning move of the sleeves 18 and the star wheels 20 to the ment of the counter-wheels. left hand ends thereof, the star wheels and As a modification of my invention, I con pinions secured to the adjacent ends of adja template dispensing entirely with separate cent sleeves being positioned in such close 30 counter-wheels and utilizing the actuating proximity to each other that the marginal .05 wheels both as actuating wheels and counter projections on a single actuating wheel will wheels, thereby greatly simplifying the ma engage the star wheel on the right hand sleeve chine, particularly as regards the gearing by and the pinion on the left hand sleeve. Said. which counter-wheels of higher denomina marginal projections are so shaped and pro 45 tions are operatively connected with those of portioned that each marginal projection will O lower denomination, as the units counter engage the points of the star wheel associated wheel etc., withthereby the tens,correspondingly the tens with the hun therewith, while only every 10 marginal pro dreds reducing jection will engage a tooth of said pinion, the the cost of manufacture. relation being such, that when an actuating 50 This modification is illustrated in Figs. 6 wheel is turned a distance equal to the circum 5 and 7 of the drawings, in which, so far as can ferential distance between adjacent marginal be done without confusion, the same or sub projections 16, the counter-flanges 50 will be stantially similar parts are designated by the turned a distance equal to that between adja same reference characters as in Figs. 1 to 5, cent numerals thereon. to wit:-1, designates the base of the ma To insure continuous engagement of the 20 chine; 2, 2’, end plates supported thereon, on marginal projections 16 with the points of which the operative parts of the machine are the star wheel 20, the right hand sides 51 of mounted; 3, a shaft secured in said end plates said marginal projections, which align with and which rigidly connects the same; 5, nuts said star wheel are made of suitable length threaded to the projecting ends of said shaft always to engage the points of said star adapted to clamp said end plates against wheel, while, to provide for engagement of shoulders formed on said shaft, thus binding every tenth marginal projection with the the frame structure rigidly together; 7, actu teeth or notches of the pinion 19, the left ating wheels mounted to turn freely on the hand sides of said marginal projections, other shaft 3 in both directions; 16, marginal pro than those designed to engage the teeth of 130 1,829,879 5 said pinions, are cut away, as shown at 52, forming both addition and subtraction and for making corrections, in case a mistake has so that they will escape the pinions 19, and been made, as by turning the actuating wheel the left hand sides of every tenth marginal projection being made sufficiently long so by means of a wrong marginal projection. O operation, the machine is adapted that they will engage the teeth or notches to After be reset so that the character zero. on all of said pinions, as shown at 52. The actuating wheel and thus the counter. of the counter-flanges 50 will be exposed at flanges 50 secured thereto are held yieldingly the sight openings 28. In accordance with against rotation during periods of rest b the disclosure of Figs. 6 and 7, this is effected s 10 means of spring pawls or detents 53 whic by means as follows:engage adjacent marginal projections 16, and Pivotally supported so as to swing over cylindrical section 25 of the casing of the the pinion 19 and star wheel 20 are held the against rotation during periods of rest by machine between the radial sections 26 and spring pawls or detents 54 Rid to adja 27 thereof, is a bar 57, said bar being pivot 5 cent points of said star wheel, all in sub ally connected to the ends of the shaft 3, stantially the same manner as in the E. which project beyond the end frame mem ferred form of the apparatus shown in Figs. bers 2,2', by spring arms 58. Formed in the 1 to 5. As shown, the spring pawls or detents inner edge of said bar 57 are spaced notches 53 and 54 are formed integral with each 59 which are in substantial alignment with 20 other and are supported at the ends of arms the different actuating wheels 7 and are pro 55 on members 32 arranged between adja portioned to permit the passage therethrough cent actuating wheels and associated parts, of the marginal projections 16 on the differ and which are provided with holes or open ent actuating wheels. When at the forward ings to receive the shafts 3 and 17, respec limit of its pivotal movement, the right hand end of said bar 57 rides upon a fixed cam 60 25 tively. formed on the right hand end plate 2 which Operative parts of the machine are en closed in a casing which is substantially simi operates to force said plate Wi. so as to lar in construction with the casing of the pre permit the passage through the marginal ferred form of machine shown in Figs... 1 to . notches 59 therein of all of the marginal pro 80 5, and the parts thereof are designated by the jections 16 on the different wheels. Such same reference numerals, to wit:-The front endwise movement of the bar 57 is effected by and rear sections are designated by the refer flexure of the spring arms 58, which are nor ence numerals 26 and 27, and comprises ra mally under tension adapted to maintain the dially extending portions 26 and 27', which right hand end of the resetting bar in con form stops which limit turning movement of tact with the right hand end frame 2, which 00 the actuating wheels 7 by a finger of the op extends above the casing section 25, in which erator. Said casing also comprises a circu position, the left hand edges of the notches lar section 25 consisting of separate parts 59 will project into the path of movement of secured to the members 32 positioned be laterally projecting lugs 61 on every tenth OS 40 tween the actuating wheels. The separate marginal projection of each wheel, the rela parts of said cylindrical casing section 25 tion being such, that when said resetting bar are proportioned and are mounted in proper is moved from its forward position in contact position to define slots through which the with the stop surface 26 of the machine cas marginal projections 16 of the actuatin ing to its rearward position in contact with 45 wheels extend, and enclose the portions o the rear stop surface 27, any marginal pro the counter-flanges 50 which extend above jection carrying a laterally projecting lug 61 the radial portions 26, 27, of the casing of will be moved into the plane of the stop sur the machine. Also, the separate parts of face 26, 27', extending through the axis of said casing section 25 are provided with sight rotation of the shaft 3, and in which position 5 openings 28 formed therein in convenient the character zero on all of the counter position so that the numerals on the counter flanges 50 will be exposed at the different flanges 50 will be exposed therethrough when sight openings 28. Before beginning anoth the actuating wheels are in positions of rest. er computation, the resetting bar 57 will be To provide for turning the actuating swung back to its extreme forward position 20 55 wheels 7 to expose any numeral from Zero engagement with the cam 60 which will to nine, inclusive, through a sight opening into operate to spring it endwise to again bring 28 by continuous turning movement of an the notches 59 therein in register with the actuating wheel, the casing of the machine marginal projections 16 on the actuating is constructed and arranged so that at least wheels and to permit said marginal projec 25 80 nine marginal projections 16 of each wheel SO tions to pass freely therethrough. will be exposed for operation. For convenience in manipulating the reset Also as in the preferred form of the ma ting bar 57, a frontwardly projecting lip 62 chine, first described, said modified machine is constructed and arranged to be operated is formed thereon in position to be conven 30 in both directions, thus providing for per iently gripped by the operator, 6 1,829,879 I claim: . a common axis in said housing with at 1. In an adding and subtracting machine, upon least nine of the teeth of each operating wheel the combination of a housing, a plurality of projecting from the housing for manual oper toothed operating wheels revolubly mounted ation of the wheels thereby, a plurality of sets upon a common axis in said housing with at of mechanism cooperating with said operat least nine of the teeth of each operating wheel ing wheels respectively and each comprising projecting from the housing for manual Op. a pinion revolubly mounted in said housing eration of the wheels thereby, a plurality of position to be rotated in either direction sets of mechanism cooperating with said op in by the operating wheel of the same set of O erating wheels respectively and each compris. mechanism, a rotary device in each set of 75 ing rotary driving means revolubly mounted mechanism revolubly mounted in said hous in said housing in position to be rotated in ing, driving connections between the rotary either direction by the operating wheel of device and the pinion of each set of mecha the same set of mechanism, a rotary device in nism, and of means in connection with each of each set of mechanism revolubly mounted in said sets mechanism and each carried 80 said housing, driving connections between around by the rotary device of said set adapt the rotary device and the rotary driving ed by engagement with the pinion of the ad means of each set of mechanism, and means jacent set of mechanism to give said pinion of in connection with each set of mechanism and said other set and the mechanism driven each carried around by the rotary device of thereby a single step movement upon the 85 said set adapted by engagement with the ro movement said rotary device past a pre tary driving means of the next adjacent set determinedofcritical point. of mechanism to give said rotary driving 4. In an adding and subtracting machine, means of said other set and the mechanism the combination of a housing, a plurality of 25 driven thereby a single step movement upon toothed wheels revolubly mounted upon a 90 the movement of said rotary device past a common axis in said housing with at least predetermined critical point. nine of the teeth of each operating wheel pro 2. In an adding and subtracting machine, jecting from the housing for manual opera the combination of a housing, a plurality of tion of the wheels thereby, a plurality of sets 30 toothed operating wheels revolubly mounted of mechanism cooperating with said operat 95. upon a common axis in said housing with at wheels respectively and each comprising least nine of the teeth of each operating wheel ing a pinion revolubly mounted in said housing on an axis at one side of the axis on which said FE; fromwheels the housing manual op eration of the thereby,fora plurality of operating wheels are mounted and positioned 35 sets of mechanism cooperating with said op for rotation by the operating wheel of the 00 erating wheels respectively and each com same set of mechanism, a gear in each set rev prising rotary driving means revolubly olubly mounted in said housing on an axis mounted in said housing in position to be ro triangular relation to said other two axes, tated in either direction by the operating in a sleeve connected with the pinion of each set 40 wheel of the same set of mechanism, a rotary of mechanism, a second gear on the sleeve of 105 device in each set of mechanism revolubly set of mechanism and each meshing with mounted in said housing, driving connections each the first gear of the same set of mecha between the rotary device and the rotary driv nism, andnamed means in connection with each of ing means of each set of mechanism, and said sets of mechanism and each carried means in connection with each set of mecha around by the rotary device of such set of O nism and each carried around by the rotary mechanism by engagement with the device of said set adapted by engagement pinion of theadapted next adjacent set of mechanism with the rotary driving means of the next to give said pinion of said other and the adjacent set of mechanism to give said rotary mechanism driven thereby a singleset step move 50 driving means of said other set and the mech ment upon the movement of said rotary de anism driven thereby a single step movement vice in either direction past a predetermined 5 upon the movement of said rotary device point. past a predetermined critical point, said last critical 5. In an adding and subtracting machine, named means of each of said sets of mecha the combination of a housing, a plurality of 55 nism being so arranged with respect to the ro toothed operating wheels revolubly mount 120 tary driving means of the adjacent set of upon a common axis in said housing with mechanism that it stands normally out of en ed at least nine of the teeth of each operating gagement therewith and is moved into en wheel projecting from the housing for man gagement with said rotary driving means of ual operation of the wheels thereby, a plu 60 said adjacent set of mechanism for actuation rality of sets of mechanism cooperating with 25 thereof and again out of such engagement at said operating wheels respectively and each a single step movement of the operating parts. comprising rotary driving means revolubly 3. In an adding and subtracting machine, mounted in said housing in position to be ro he combination of a housing, a plurality of 65 toothed operating wheels revolubly mounted tated in either direction by the operating wheel of the same set of mechanism, a rotary 30 20 1,829,379 device in each set of mechanism revolubly mounted in said housing, driving connections between the rotary device and the rotary driving means of each set of mechanism, and means in connection with each set of mecha nism and each carried around by the rotary device of said set adapted by engagement with the rotary driving means of the next ad jacent set of mechanism to give said rotary O driving means of said other set and the mech anism driven thereby a single step movement upon the movement of said rotary device past a predetermined critical point, the rotary driving means of each of said sets of mech anism being so arranged as to rotate in either direction independently of rotation of the operating wheel of the same set of mecha nism when such rotary driving means is given said single step movement by power applied 20 from the adjacent set of mechanism. In witness that I claim the foregoing as my invention I affix my signature this 16th day of October, A.D. 1926. ANDERS VETHE. 30 35 40 45 50 55 80 65