Nov. 11, 1947. O. E. BATORI 2,430,599 SLIDE RULE Filed July 22, 1944 3. Sheets-Sheet l R. P. P. P. P. Resear-R- sala.Naaaaaaayaaaahe he GG 4AAAAA41444/azae area at a M. P-O-NAaaaSalaa AAAN ani4 n s Oscar A. Asaforf fly Yamy roar a 442.4%as abney Nov. 11, 1947. O. E. BATOR 2 430,599 SLIDE RULE Filed July 22, 1944 3 Sheets-Sheet 2 3-1a6.// •/n64y Oscar A. Assyfoyf /m Wewtor A/3 oney Nov. 11, 1947. O. E. BATORE t 2,430,599 SLIDE RULE Filed July 22, 1944 3. Sheets-Sheet 3 i Oscar A. Aa/t/7 MAV/AmvroA a/624.7a,W As Waty Patented Nov. 11, 1947 2,430,599 UNITED STATES PATENT OFFICE 2,430,599 SLIDE RULE Oscar E. Bátori, New York, N. Y. Application July 22, 1944, Serial No. 546,085 6 Claims. (CI. 235-84) 1. 2 This invention relates to computing devices of arrangement and in the new selection and dis the slide rule type and specifically is an improve position of the scales applied. ment upon the devices of this character which For the Sake of better explanation, a brief com form the subject matters of my applications for parison is made between prior slide rules and this Letters Patents of the United States, filed August invention. 2, 1941, Serial No. 405,235, which is now Patent Prior slide rules, in general, apply two scales in No. 2,358,309, granted September 19, 1944, and a simple calculation, which represent all the in May 20, 1944, Serial No. 536,473, now Patent No. gredients of a computation, and the different 2,415,231, granted February 4, 1947, respectively. computations, respectively. One scale, generally One important feature of those inventions is 10 called the base Scale, is used for the multiplicand the Simultaneous moving and setting of the co and the product, is case of multiplication, and acting scales, whereby the two factors of a Com for the dividend and the quotient, in case of di putation, represented by such two coacting scales, Vision, that is for four ingredients-in the two are set simultaneously so that the computation cases. The other coacting scale called the slide is greatly expedited. For this purpose an ade 5 scale is used for both, the multiplier and divisor quate arrangement is employed, among others in the respective computations, that is for the two rotating discS, with a driving mechanism for two ingredients in two different computations. each disc. Complementary to their mechanism, The Same two Scales being used for different Selected scales are placed on their different parts purposes the procedures are different and certain in an adequate arrangement in accordance with 20 rules are to be followed in the procedure, which the mechanism. are complicated for the users without mathemati I have found, that this feature of my said cal background and require considerable mental earlier invention, that is the simultaneous Setting efforts even by the advanced users. Prior slide of the two factors of a computation, is not re rules, in general, apply one indicator, which is quired in all cases. With that changed condi 25 used to set the factors of a computation in se tion of the computations, that is With the Omis quence and then it is moved to indicate the re sion of the simultaneous setting of the two factors Sults. It is used for both purposes-and when of the computation, the device can be simplified. ever Set, anew, it destroys the previous indication, In arrangement, in mechanism and in the selec having been moved away from it. The result of tion and disposition of the scales, that is in the 30 a computation, which is understood to be the Scale System. product in a multiplication, and the quotient in With this in mind I have modified in part my a division, Will appear at different locations in said earlier invention. the slide rule. This invention departs from the The said two rotating discs, each of which has prior slide rules in the scale system and in the offset parts in said earlier device, are now made 35 procedure. Eliminates the setting rules in the plane. One of the two, the rear disc, which is procedure, by the application of separate scalies rotatable in the earlier device, is being kept ro for each ingredient of the computation, and des. tatable, in this too, on the other hand, the other, ignates the scales according to their purpose. the front disc, which is rotatable in the earlier There is a scale for the number to be multiplied device, is made stationary in the present One. 40 or divided, a scale for the multiplier and a scale The driving mechanisms of the rotatable discs for the divisor. Each one of these scales are cor of the earlier devices, are being omitted in this respondingly labeled as "Number,” “Multiplier,' one. For rotating the rear disc of this invention, “Divisor' and “Result.' The procedure consists a simple arrangement is applied, which consists of the pure mechanical application or setting of of a bolt axle with a knob at its end, instead of 45 these SO labeled scales-instead of being gov the two separate gear mechanisms of the earlier erned by setting rules as with prior slide rules. devices. This invention applies three indicators each one By those modifications the device, as a mech indicating one of the three ingredients, keeping anism, is simplified, and its production costs their indications throughout and at the end of greatly reduced. 50 the procedure. One important improvement is Having modified in part the mechanism, and the application of a result indicator member, as in consequence of it, the selection and disposi a separate special indicator. It is the sole indi. tion of the scales has also been modified, cator for the results and for the results only. It A slide rule is provided through the present is stationary-and as such automatic. No move invention by which numerical, trigonometric and 55 for its placement is required. It indicates the exponential problems can be solved in a new pro numbers, representing the results, at a permanent cedure. Specifically, computations, where differ location of the device and in vertical position, ent terms are involved, are solved in a more sim facilitating the finding and the reading of these ple, characteristic and positive manner. numbers, being especially advantageous in case The invention resides in the new mechanical 60 of slide rules of the circular type. It holds this 2,430,599 3 4 feature regardless of the kind of computations tion of the ring interfere with the peg, which then and of the terms involved. It indicates the re may be put in the other hole. Sult at the same location, in vertical position Result indicator member 5 is a circular plate, uniforninly-in simple computations, in continu having a for Wardly offset rim 9 and another offset ous computations, in combined computations and part 6, on its lower part, as viewed in Figs. 1 and in computations involving different tel'ms. 2. Which is the continuation of the circular plate Another important feature of this invention is, 5 in an outward direction. The offset part 6 is of that the procedures With different terms are sepa transparent material to expose the scales under rated-by different Scales for different terms on it, on indicator ring member 3 and ring 4. It has independent members of the device. 10 an opening 8 and a thin wire 23 in its middle, The application of separate scales for the multi Which is called the result indicator, being the Soie plier and the divisor implies also the Separation indicator of the result of any computation. AC of the procedures of the multiplication and divi cordingly it is designated with the Word "Result.' SOil. This result indicator member is fixed to the hous Prior slide rules have in general three men 15 ing member 2 by screws. The screws are pass berS-One base, One Slide, and one indicator. ing through the front flange of the housing mem Slide and indicator are movable. This invention ber 4, have depressed heads which hold the leg has an entirely different arrangement. It has part 6 and the stationary indicator itself in place four members. One housing, one rotating disc, against rotation as Will be understood. It is sta One indicator ring and One result indicator. Of 20 tionary and so are with it the result indicator 8 these four members the housing and the result and its indicator line 23. In its center it has a hole indicator are Stationary-the disc and indicator which accommodates the bolt is, which in turn ring are rotatable. In the figures, With the ex holds in place the center of this result indicator ception of the result indicator, all of the afore member. Ring 4., described before is Secured to Said elements carry Scales on then. These and 25 housing member 2 by ScreWS. other objects of this invention are obtained by Rotatable disc member is a circuliar plate, the proper selection and disposition of logarithmic secured at its center to bolt i 6. Rotating 2 olt scales and by an adequate mechanical arrange 6 by knob i. 9 will rotate disc member . Bolt ment all embodied in the device, as it will be 6 is journalled in housing member 2 and result described in detail, hereinafter, reference being 30 indicator member 5. It carries tWO Spacing Wash had to the drawingS, in which: ers T and 8, which are providing for adequate Fig.