US1203988A - Combined type-writing and computing machine. - Google Patents

Description

G. 0. DEGENER &E. SAUNDERS.

COMBINED TYPE WRITING AND COMPUTINGYMACHINE.

APPLICATION FILED DEC.23.19H-

Patented Nov. 7 1916.

3 SHEETSSHEET I.

WITNESSES! $7 7M 9 @IgVENTORS ATTORNEYL G. 0. DEGENER 64 E. SAUNDERS.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION .FILED DEC.23. 19!). 1,203,988.

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@Kz/ ATTORNEY G. 0. DEGENER & E. SAUNDERS. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED DEC. 23, l 9! I.

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ATTOBNEY WITNESSES: 2 W 2% UNITED STATES PATENT OFFICE.

GUSTAVE O. DEGENER AND ELIAS SAUNDERS, OF NEW YORK, N. Y., ASSIGNORS TO UNDERWOOD COMPUTING MACHINE TION OF NEW YORK.

COMPANY, OF NEW YORK, N. Y., A CORPORA- Specification of Letters Patent.

Patented Nov. 7, 1916.

Application filed December 23, 1911. Serial No. 667,464.

To all whom it may concern Be it known that We, GUSTAVE O. DEGENER and ELIAS SAUNDERS, both citizens of the United States, and residing in the city, county, and State of New York, have 1nvented certain new and useful Improvements in- Combined Type-Writing and Computing Machines, of which the following is a specification.

This invention relates to special forms of computing mechanism, and is herein described as applied to a combined typewrlting and computing machine of the Underwood-Wright type and as adapted to compute in English or sterling money.

In most computing machines the mechanism is limited to numbers employing the decimal system of notation. In English money, for example, there are twelve pence to one shilling and twenty shillings to one pound, and no ordinary computing machine will properly write and add such money without various complicated manipulations on the part of the operator. This invention is designed to enable such computations to beperformed with ease and rapidity.

The invention consists in one aspect of providing a special key which is arranged to operate a type printing one number, but computing another in the computing mechanism. This key is in addition to the key which normally Writes said number and computes the identical number.

In the specific form here illustrated, certain keys are in such a combination with the platen shift mechanism which controls the relation of the platen to the type, that by shifting the platen, ten or eleven pence may be written in, in ordinary figures, while at the same time, the computing mechanism without any alteration, adds in the corresponding numbers to the computing machine. Here the result is accomplished without adding any special keys to the ordinary key-board of a case-shift writing machine and without the highly complex mechanism sometimes employed. On the upper case of the type heads bearing 5 and 6 may be placed a figure 1 and the type keys are correspondingly marked, and on the upper case of type head bearing figure 4 may be placed 0 and its key is marked to is controlled by correspond. Then to add and write ten pence it will be sufficient to depress the platen shift key, strike the numeral key bearing 6 in its lower case and then the numeral key bearing 4 in its lower case. Similarly to write eleven pence, depress the case-shift key and strike the key bearing 6 in its lower case and then the key bearing 5 in its lower case which add to eleven, and since the 5 and 6 keys are arranged to print 1 in upper case, the keys will also write 11 In application 652,532, filed October 3, 1911, a master wheel moves step by step with the typewriter carriage, successively engaging gears which rotate the computing wheels and rotating them to an extent regulated by the numeral keys. Tens carrying mechanism is provided between the successive computing wheels. In the present invention when the shillings column is reached an alteration may be made in the carrying over mechanism. This is so arranged that the carrying over wheel for the tens shillings column will operate at every alternate unit space, thus adding in a pound for every twenty shillings recorded. In the pence column a broad numeral wheel may be provided, having two columns and engaging a correspondingly broad gear wheel which is driven by the master wheel and which gear that master wheel precisely as are the ordinary decimal gears. This gear is so related to its dial wheel that each unit movement of the master wheel rotates this dial wheel one twelfth of a revolution, namely; one unit. Therefore the largest numeral key 9 will only turn this dial wheel nine units or twelfths of a revolution. Ten pence and eleven pence are computed by operating more than one numeral key; and since this pence gear covers two letter spaces, the master wheel will engage it while two numeral keys are successively struck in the normal operation of the machine, and computethem both in the pence column. One convenient method of arranging numeral keys has been described above for thus computing ten and eleven pence.

The carrying of a shilling at each twelve pence is accomplished by changes in the carrying-over mechanism. In some aspects this invention may be regarded as an improvement on the co-pending case No. 652,532 filed October 3, 1911.

Other features and advantages will hereinafter appear.

In the accompanying drawings, Figure 1 represents a side view of an Underwood- Vright computing machine, showing so much thereof as is necessary to understand the present invention. Fig. 2 is a skeleton perspective view of the connection between the numeral keys and parts of the computing mechanism. Fig. 3 is a section through the casing containing the computing wheels, and some other allied parts. Fig. 4 is a section showing the tens of shillings wheel together with some of its connecting gearing. Fig. 5 is a similar perspective view of the pence wheel. Fig. 6 is a diagrammatic View showing the relation between the numeral keys and the types which they control. Fig. 7 is a view of the computing head partly broken. Fig. 8 is a section of the same. Fig. 9 is a diagrammatic View of an alternative arrangement of numerals. Fig. 10 is a diagrammatic view of another arrangement of numerals.

In the UnderwoodJVright type of combined typewriter and adding machine, letter keys 1 and figure keys 2 depress levers 3 having returning springs 4. These levers are connected, by means of bell cranks 5, to type bars 6, which are swung up to strike against the face of a platen 7. The type bars are pivoted upon a fulcrum wire 8 and have heels 9 to press rearwardly a universal bar 10, which is mounted on a frame 11 to operate dogs 12, 13, which coiiperate with an escapement wheel 14 connected with a pinion 16 to mesh with a rack 17 upon a carriage 15 which carries said platen 7; the carriage being driven by a spring barrel 18.

Each figure key 2 is also connected by a hook 19, a lever 19", and a link 20, (Fig. 2), to a lever 21 pivoted at 22 and forming one of a series of levers grouped radially, and each carrying a jack 23 to displace, namely set up, computing pins 24 in a power driven wheel 25. This wheel is driven by a constantly rotating motor 26, connected by gears 27, 28, 29, 30 and 31, to said wheel 25, and tending constantly to turn the latter; a friction safety clutch 32 being interposed between the motor and the wheel 25. A four toothed pinion 33 fixed to an escapement v wheel 34, intercepts the path of the pins when projected as they turn with wheel 25. This (SCHPGIDGHC wheel, (Fig. 1), is controlled by d gs 35, 36, fixed upon a rock shaft 37, which is also controlled by the figure keys 2; and each of the levers 21 has an arm 38 to bear against a'disk 39, which is connected to lever 40 having a pivot between its ends as at 41, and connected by a link 42 to an arm 43 fixed upon rock shaft 37.-

\Vhen any key 2 is depressed, it rocks the shaft 37 in one direction, allowlng the teeth of wheel 34 to slip off from the dog 35 onto to normal position by suitable means, not shown.

.75 ion 33. After each pin is used, it is restored- To the pin carrying wheel 25 is geared a shaft 45 of a master wheel 46; the connection including gears 47, 48, 49, 50, 51 and 52, the latter fixed upon the shaft 45, to which the master wheel is splined.

The master wheel has opposite teeth 53 to engage internal gears 54, (Figs. '4, 5), formed upon computing wheels 55, the latter having gears 56 meshing with gears 57 provided upon dial wheels 58.

The rotative movement of the pin carrying wheel 25 is transmissible to any of the dial wheels. These dial wheels are mounted in a casing 59 which is secured upon the framework of the machine. The master wheel 46 is connected to a tubular arbor 60, which is connected to the carriage 15 of the typewriter, to move step by step therewith; the connection comprising a lever 61 pivoted at 61* midway between its ends, and connected at its forwardfend to said tube 60, and at its rear end to the carriage by one or more lugs 63 on a bar 62 carried by the carriage. The master wheel 46 travels to the right, (Fig. 8), as the carriage 15 travels in letter feeding to the left; the writing and adding proceeding from the higher to the lower denomination. Upon each of the computing'wheels 55, is a special tens-carrying tooth 64, which once in each revolution engages androtates a five toothed pinion 65, fixed to which is an ordinary pinion 66 meshing with the gear 56 of the next higher denomination, whereby tens are carried upon the latter. To assist at the tens-carrying operation,

there is provided a mutilated assisting gear 67 which comprises five sets of teeth at equal intervals. The mutilated, gear 67 which is fast to the pinions 66 and 65, is arranged to be engaged by one of a series fixed upon a shaft 69, the latter bei gconof constantly rotating pinions 68, which are nected to the constantly rotating m tor 26 by means of a train of gears designated generally'as 70. The special tooth 64 on the computing wheel 55 rotates the mutilated gear 67 enough to engage it with the constantly rotating pinion 68; the latter thereupon drives the mutilated gear, with its two connected pinions, until the tens-carrying operation is substantially completed. A

spring detent 71 for each mutilated gear, snaps into'a seat 72, of which five are provided upon each mutilated gear 67 of a decimal dial wheel, and holds the figures on the dial wheels alined,

In order to accomplish the carrying of pence into shillings and shillings into pounds, the special carrying tooth, herein described before as 64, must have a differon an idle collar 55 on the pence computlater described.

ing wheel 55. The gears 73 and 73 are of the same size, and the collar serves to align the pence wheel in a manner to be As there are twelve divisions on the pence wheel, said wheel will accordingly have to be moved in twelfths of a revolution, and as the master wheel moves the gear 74 in units of one tenth of a revolution, the ratio between the gear 7i and the gear 73 is accordingly ten to twelve.

It will be seen in Fig. 8, that the internal gear 54", which is the driver of the pence wheel 73, is twice the width of the ordinary internal gear 54, for when there are ten or eleven pence to be added, two digits or figures are printed in adjoining letter spaces, causing two computations to be made on the same-dial, and the master wheel must engage with the gear in each letter space. The printing of ten pence and eleven pence is done as described below.

The machine herein illustrated, as is usual in Underwood typewriting machines, comprises a platen shift key 76 which depresses a lever 77 to throw a bell crank 78 at the rear of the machine, which carries a shift rail 7 9. On this shift rail runs a wheel 80 which, through an arm 81, is arranged to shift the platen frame 8:2, so that the types 83 in the lower and upper case strike the paper on the platen 7 Normally the lower case types 84 strike the platen. The numeral keys 2 have on them each two figures 85 and 86 corresponding respectively to the upper and lower case types, so that when it is desired to write in the upper case, the platen shift key 76 is depressed; then while this key is held depressed, a type key 1s struck and the upper figure 83 on the type will make its imprint on the work.

In the machine shown as illustrated in Fig. 6, the depression of the platen shift key 76 in no way alters the computing mechanism per se. But the numeral key 2 bearing the character 4: has marked on it in its upper case a 0; the numeral key 2 having its lower case marked 5, has its upper case marked 1, and the numeral key 2 having its lower case marked 6, likewise is marked 1, and these keys operate types which are correspondingly made. If now, the machine stands at a position to write in the tens space in the pence column, and it is desired to write ten pence, a number 1 may be written therein by depressing the platen shift key and striking the type key bearing the number 6 in its lower case; then as has just been described, the type will imprint a 1 in that space. Then while holding the'platen shift key depressed, if the key bearing the number 4 is struck, a 0 will be written. Thus while the figures composing the number 10 have been written, the numbers six and four forming ten,

have been added in, because the computing mechanism has been acting precisely as if the platen shift key had not been operated. In the same way, if it is desired to write 11 in the pence column, the key bearing the lower case 6 is struck while the platen shift key is depressed and the key bearing the lower case 5 is struck with the platen shift key depressed. Then it i apparent that 1 will be written twice with a letterspace interval in the pence column, showing 11 pence, while at the same time, six and five have been added in the computing mechanism' thus making eleven added. in and recorded.

When the computations on the p nce dial have reached twelve, the dial whee 73 will have made a complete revolution, and the sum amounting to one shilling, is carried to the shillings dial wheel 58 as follows: During the rotation of the pence dial 7 3, the gear 73*, between the two columns of the dial wheel 73 and fast to said dial wheel, rotates the gear 73 which carries a broad tooth 73, that in passing, strikes and starts to turn a toothed star wheel or pinion (35.

This pinion 65 has fast to it a pinion 66 which constantly engages a gear 56 on the T units of shillings wheel, and also comprises seats 72 for a detent 71. Thus said pinion has the same construction and the same functions as the pinion 65, hereinbefore described in the tens carrying of the totalizer, but as seen in Fig. 8, the hub of this carryover pinion is elongated to correspond to the breadth of the collar 55. v

To prevent an overthrow of the pence dial wheel, a spring detent 71 (Fig. 8), like that provided for the decimal wheels, snaps into a seat 7 2 of which there are six provided upon a special detent wheel 67*. Said detent wheel 67 is fixed to a gear 67 in mesh with the collar gear 7 3", which gear 67 being one half the size of the collar gear 73 travels twice as fast, and so turns twotwelfths or one sixth of a revolution, for every unit represented by the key struck for the computation. Thus the detent 71 justifies the pence dial for each twelfth of a revolution.

To compute shillings, an ordinary dial wheel 58 is used in theunit column 58 having the same tens carrying arrangements as the'usual decimal form, but in the tens colunm of shillings, the dial wheel 58*, has the numerals reading, 1, O, 1, O, 1, 0, etc., while the computing wheel has five broad teeth 64, so that it carries into the unit pounds column at every second unit movement. The pounds are computed on the decimal form of totalizer. In order to allow thebroad teeth 64 and 73 to pass the dial wheels without tending to lock them, a hollow 75 is provided for each of said broad teeth into which they may go.

It will be noted that .while the mechanism is described as being adapted for computing English money, it may be also used for computing in twelfths. To do this the operation of the keys is identical with that described for writing pence. For writing twelfths and computing them properly it will be found best to arrange the mechanism so that the last digit of the numerator of the twelfths is at the last computing wheel. Then a diagonal is written on the work sheet,-to divide the numerator from the denominator, and afterward a 1 and 2 are written in as denominator. If the computing mechanism is set as just described the denominator, although written on the work sheet, will not be added in. Hence the twelfths may be directly read from the computing wheels. For example 1 10/12 is written, and this will be properly computed if the computing mechanism and typewriter are so arranged that the zero falls in the last letter space in the last column in which computing is done. In that case, the denominator of the number will not be added into the computing mechanism.

In Fig. 9, an alternative arrangement of the numerals on the keys is shown in which the 1 for writing the tens figure of the numerator of twelfths or of shillings, is

placed in the upper case of 4; the zero in the upper case of 6, and 1 in the upper case of 7. This latter 1 is only used in writing the second 1 of 11. The type heads operated by these numeral keys are respectively made to correspond. Other arrangements will be obvious to those skilled in the art.

It willbe observed that the invention is not limited to computing twelfths. In Fig. 10, is shown an arrangement of numerals for computing of sixteenths. This might be equally used for computing in Indian money, in which sixteen annas make one rupee. Other arrangements of keys for computing other kinds of units Wlll also be obvious to those skilled in the art. Of course, in all cases, the type heads must be made to correspond to the numeral keys,

and where uni-ts other than twelfths are used, corresponding changes must be made in the numeral wheels and carrying-over mechanism. In other words the present invention is directed to enabling numbers to be computed to more than one base, twelfths being numbers to the base twelve, sixteenths to the base sixteen, etc.

Variations may be resorted to within the scope of the invention, and portions of the improvements may' be used without others.

Having thus described our invention, we claim: p

1. In a computing machine, the combination with a single set of digit keys, of computing wheels, a common drive engaging said computing wheels to carry into each a single digit as recorded by said keys, another computing wheel arranged to receive two digits from said common drive, and means controlling said common drive exclusively from said digit.

2. A key for a typewriting and computing machine bearing the numerals 4 and 0, and connections whereby said key selectively prints either, but always computes the same.

3. A key. for a typewriting and computing machine bearing the numerals 5 and 1, and connections whereby said key selectively prints either, but always computes the same. V

4. A key for a typewriting and computing machine bearing the numerals 6 and 1, and connections whereby said key selectively prints either, but always computes the same.

'5. The combination with a computing mechanism, of a typewriting mechanism having solely a set of nine digit or numeral keys, including both a numeral key arranged to cause an actuation of said computing mechanism according to a predetermined amount, and a second numeral key arranged to cause the actuation of said computing mechanism according to a predetermined amount, and means to enable said numeral keys when actuated in succession to print a two-figured number, the individual digits of which differ from the predetermined amount which the corresponding keys cause said computing mechanism to compute and whose digits taken together represent an amount bearing a definite relation to the aggregate computing eflect caused by both said numeral keys.

6. The combination with a computing mechanism, of a typewriting mechanism having solely a set of nine digits or numeral keys including a pair of numeral keys connected to actuate both said computing mechanism and said type-writing mechanism, the keys of said pair each causing an actuation of said computing mechanism corresponding to its own individual value, and means to enable said typewriting mechanism to print at the successive actuations of said pair of numeral keys, a two-figured number Whose individual digits difier from the values of the corresponding keys which print them, and which number as a whole represents the sum of the combined compu- Lation caused by said successively operated eys.

7. The combination with a computing mechanism, or" a typewriting mechanism, a single set of digit printing keys ranging from 1 to 9 arranged to operate said computing mechanism to compute in an ultra-decimal system, said numeral keys being arranged to cause actuations of said computing mechanism amounts corresponding to their direct values, and shifting means for enabling certain of said keys to print with said typewriting mechanism digits corresponding to their direct values and other digits diifering from their direct values, said keys being combinatively actuable in a plurality of pairs, so that when the keys of a pair are actuated in succession, the individual digits printed'concomitantly with their actuation and differing from the normal values of the corresponding keys will combine to designate the sum of the normal values of such keys.

8. The combination with a computing mechanism, of a typewriting mechanism, a single set of digit printing keys ranging from 1 to 9 arranged to operate said computing mechanism to compute in an ultra-decimal system, said numeral keys being arranged to cause actuations of said computing mechanism amounts corresponding to their direct values, and shifting means for enabling certain ofsaid keys to print with said typewriting mechanism digits corresponding to their direct values and other digits difiering from their direct values, said keys being combinatively actuable in a plurality of pairs so that when the keys of a pair are actuated in succession, the individual digits printed concomitantly with their actuation and diiiering from the normal values of the corresponding keys will combine to designate the sum of the normal values of such keys, certain of said keys being usable in different paired combinations and being capable of representing one of the figures of a two-figured result brought about by the successive actuation of the two paired keys in each pair in which it is applicable.

9. The combination with a series of computing wheels arranged to compute numbers as to enable it to be rotatively engaged by said master wheel at two separate points successively in computing a number equal to or greater than ten, the amounts added at each of such rotations being less than ten.

10. The combination with a computing mechanism, of a typewriting mechanism, a series of numeral keys including digit keys 6 and 4, the digit key 6 being arranged to actuate said computing mechanism to compute six and to actuate said typewriting mechanism to print 1, and the digit key 4 being arranged to actuate said/computing mechanism to compute four andto actuate said typewriting mechanism-, to print 0.

11. 'fihe combination with a computing mecharism, of a typewriting mechanism, a series of numeral keys for actuating both said typewriting mechanism and said computing mechanism, said numeral keys including digit keys 6 and 5, and means to enable said 6 digit key to actuate said computing mechanism to compute six and to actuate said typewriting mechanism to print 1, said means also enabling said 5 digit key to actuate said computing mechanism to compute five and to actuate said typewriting mechanism to print 1.

12. The combination with a computing mechanism, of a typewriting mechanism, a series of numeral keys for actuating both said computing mechanism and said typewritin mechanism, said numeral keys having values ranging from 1 to 9, and means to enable two of said numeral keys, the sum of whose values equals ten, to actuate said computing mechanism to compute ten by successively adding their respective values and also to enable said typewriting mechanism to print 10, one of said keys enabling the printing of the l and the other of said keys enabling the printing of the :0 of the two figures comprising the 13. The combination with a computing mechanism, of a typewriting mechanism, a series of numeral keys for actuating both said computing mechanism and said typewriting mechanism, said numeral keys having values ranging from 1 to 9, and means to enable a pair of said keys, the sum of whose values is eleven, to actuate said computing mechanism to compute eleven by the adding successively of the respective values of such keys and enabling said keys to actuate said typewriting mechanism to print 11, each of said keys controlling the printing of 1. 4

14. The combination with a computing mechanism, of a typewriting mechanism, a series of numeral keys for actuatin both said computing mechanism and sai typewriting mechanism, said keys having values ranging from 1 to 9, two of said keys, the sum of whose values equals ten, paired to actuate said" computing mechanism to compute ten by adding successively the values of such keys, and actuating said typewriting mechanism to print 10, one of such keys enabling the printing of 1 and the other 7 of said keys enabling the printing of 0 of 10, and two of said keys, whose sum equals eleven, pairing to actuate said computing mechanism to compute eleven by the successive adding of the values of these latter paired keys, and actuating said typewriting mechanism to print 11, each of said latter paired keys controlling the printing of C 1 15. In a typewriting and computing machine, the combination, with an ultra-decimal computing wheel, and a drive therefor; of a pair of numeral keys operable in succession to print the digits of a two-digit number and cause the complete computation of such number on said wheel, each of said keys acting to compute a digit different from the one which it actually prints, the sum of the digits so computed exactly equaling the number printed. I 16. In a typewriting and computing machine, the combination, with a set of computing wheels, including decimal and ultradecimal wheels, and a drive for said wheels;

of a set of nine numeral keys solely controlling the extent of rotation of all of said wheels and including a pair of keys operable in succession to print the digits of a twordigit number and to cause the complete computation of such number on the ultradecimal wheel: each key of said pair causing the positive drive of saidultra-decimal wheel a predetermined fractional part of the number so computed.

17. In a typewriting and computing machine, the combination, with a set of computing wheels, including decimal and ultradecimal wheels, and a drive for said wheels; of a set of nine numeralkeys solely controlling the extent of rotation of all of said wheels and including a pair of keys operable in succession to print the digits of a twodigit number and to cause the complete oomputation of such number on the ultra-decimal wheel; one key of the pair acting to print one of the digits ofjthe number and to compute a diflerent digit on the ultra-' decimal wheel, and the other key of the pair acting to print the other digit of the number and likewise to compute a different digit on said ultra-decimal wheel; each key of the said pair acting to print a digit, and to compute the same digit on the decimal wheels.

18. In a typewriting and computing machine, the combination, with a set of computing wheels, including decimal and ultradecimalwheels, and a drive for said wheels; of a set of nine numeral keys solely controlling the extent of rotation of all of said wheels and including a key operable to print a given digit and to compute the same digit on any one of said wheels, and also including a pair of keys operable in succession to print the digits of a two-digit number and to cause the successive computation on the ultra-decimal wheel of two digits which are both less than ten, and which difler from the digits of the number actually printed, but

which exactly total such number.

19. In a typewriting and computing machine, the combination, with a set of computing wheels, including decimal and ultradecimal wheels, and a drive for said wheels; of a set of nine numeral keys solely controlling the extent of rotation of all of said wheels; and a case-shift mechanism controlling upper and lower case printin by said keys; said set of keys including a key operable to print and compute a given digit, and a second key operable to print the same digit as the first key in upper case and another digit in lower case, but always computing the said other digit.

20. In a typewriting and computing machine, the combination, with a set of computing wheels, including decimal and ultradecimal wheels, and a drive for said wheels; of a set of nine numeral keys solely controlling the extent of rotation of all of said Wheels; and a case-shift mechanism controlling upper and lower case printin by said keys; said set of keys including a my operable to print a given digit in one case and compute that digit on the ultra-decimal wheel, and also operable to print a difi'erent digit in the other case, but to compute the first digit on said ultra-decimal wheel.

' 21. In a computing machine, the combination, with a set of computing wheels, includ ing decimal and ultra-decimal wheels, and a drive for said wheels; of a set of nine numeral keys solely controlling the extent of rotation of all of said wheels, and including a pair of keys each of which is operable individually upon any one of said wheels to compute a given digit thereon, and both of which are operable consecutivelyupon the ultra-decimal wheel to jointly compute thereon a two-digit number which equals the sum of the separate digits.

22. The combination of a master wheel; a y

tively movable step by step, and said computing wheel being operable by said master wheel in two consecutive step-by-step positions, thereby to add upon said computing wheel amounts corresponding with the two consecutive rotations of said master wheel; numeral keys to control said master wheel; a case-shift mechanism; and means to enable said keys to print at the operation of said case-shift mechanism a number corresponding to the sum of the separate amounts added upon said computing wheel at the two consecutive operations of said keys, whereby a number comprising two digits may be printed upon the worksheet, and a corresponding number added into the totalizer by means of said computing wheel, by reason of the successive additions performed thereon by the master wheel at the successive operations of the keys to print said number.

23. In a typewriting and computin machine, the combination, with a plurahty of computing wheels, and a drive therefor; of aset of nine numeral keys solely governing the extent of drive; and a case-shift mechanism for controlling upper and lower case printing; certain of said keys adapted to print different digits in upper and lower case, but always computing the digits in lower case, so that when actuated in succession to print a two-digit number in upper case, the digits successively computed by said keys will differ from those of the number actually printed, but will aggregate an amount bearing a prescribed relation to such number.

24. In a typewriting and computing machine, the combination, with a plurality of computing wheels, including an ultra-decimal wheel, a master wheel for driving the computing wheels seriatz'm, and a carriage for producing relative step-by-step movement between said computing wheels and said master wheel; of a set of nine numeral keys controlling the step-by-step movement of the carriage and solely governing the extent of rotation of the master wheel; certain of said keys paired for operation in succession to print two-digit numbers and cause their computation by said master wheel on said ultra-decimal wheel; a case-shift mechanism; and means controlled by said caseshift mechanism for causing said paired keys, when so operated, to successively compute on said ultra-decimal wheel digits which difler from those of the number actually printed but whose combined computation exactly totals such number; said ultradecimal wheel constructed to remain operatively engaged by said master wheel during the operation of both keys.

25. In a typewriting and computing machine, the combination, with a plurality of computing wheels, including an ultra-decimal wheel, a master wheel for driving the computing wheels seriatz'm, and a carriage for producing relative step-by-step movement between said computing wheels and said master wheel; of a set of nine numeral keys controlling the step-by-step movement of the carriage and solely governing the extent of rotation of the master wheel; certain of said keys paired for operation in succession to print two-digit numbers and cause their computation by said master wheel on said ultra-decimal wheel; and means for causing said paired keys, when so operated, to successively compute on said ultra-decimal wheel digits which differ from those of the number actually printed but whose combined computation exactly totals such number; said ultra-decimal wheel constructed to remain operatively engaged by said master wheel during the operation of both keys.

GUSTAVE O. DEGENER. ELIAS SAUNDERS.

lVitnesses K. FRANKFORT, B. GOLDBERG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D G.

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