Nov. 5', 1946. N. w. FE-LD'MAN I _ 2,410,437 COMPUTER . Filed Sept. 19, 1945 2 Sheets-Sheet '1 FINIIII J~ '5 j -' ‘ ' > ' NATHAN BY INVENTOR. W FELDMAN. . ' . WLW - Ar-ronuzv. Nov. 5, 1.946. ~ ‘ @w. FELDMAN v2,410,437. COMPUTER ' Filed Sept. 19, 1945 2 Sheets-Sheet 2 IN VEN TOR. NATHAN W. FELDMAN. ' ATTORNEX Patented Nov. 5, 1946 2,410,437 UNITED STATES PATENT OFFICE‘ 2,410,437 COMPUTER Nathan W. Feldman, Newark, N. J. Application September 19, 1945, Serial No. 617,415 3 Claims. (01. 235-78) ‘(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 1 2 This invention relates to computers and partic in which the ?nal answer may be expressed in ularly to a disc computer for use in determining percent of rated discharge capacity. Further objects and advantages of this inven the ampere hour discharge of storage batteries during testing operations. tion, as well as its construction, arrangement and operation, will be apparent from the following description and claims in connection with the In testing conventional storage batteries it is customary after charging a battery to discharge the same at a constant rate, for example, at the rate of about 10 amperes per hour. A record is accompanying drawings, in which, made of the starting time of the test, and dis charge is continued until voltage of the storage _ battery drops below a predetermined minimum, at which time the test is automatically termi nated and a record of the ?nish time made. Computation of the ampere hour discharge of between the start of the test and the ?nish there of, and multiplying such lapse of time by the rate of discharge, for example, 10 amperes per hour. The present invention provides a disc computer in which only a single setting need be made to ‘ perform the computation. This setting consists in adjusting the discs of the computer to indi cate the starting time of the test and it is then ing part of the computer shown in Figure 1. Figure 3 is a fragmentary view in enlarged sec; tion taken substantially along line 3—3 of Fig With reference to the drawings in detail, the computer forming the present invention com prises an ampere hour disc II, a minute disc I2, an hour disc I3 and a masking disc I4. Ampere hour disc II is of largest diameter, minute disc I2 is of next largest diameter, masking disc I4 is the next largest diameter and hour disc I3 is of smallest diameter. These four discs are ar ranged concentrically with ampere hour disc II possible to read the ?nishing time on the com puter and in registration therewith will be round the ?nal answer expressed in ampere hours. In certain storage batteries discharge is at the on the bottom and with discs I2, I3 and I 4 ar ranged thereabove in that order. Discs II, I2, I3 and I4 are mounted upon a spindle 15 (Figure 3) having an enlarged head I6 below ampere hour disc II. A washer I‘! is disposed on spindle I5 above disc I4, and a locking nut I8 secures the discs in place upon spindle I5. Discs I2, I3 and M are locked together by a cotter pin I9 having an enlarged head 20 above disc I4, and having legs 2| which are spread apart beneath disc l2. An arcuate slot 22a is formed in disc I3 and cotter pin I9 extends through slot 22a whereby disc I3 may be rotated through an are relative to discs I2 and I4. Disc I 4 is provided with an observation opening 22 and is further provided with a series of four openings 23, 24, 25 and 26, spaced 90° apart from each other about the periphery of the disc. Disc I4 is further provided with an arcuate cut away portion 21 whereby disc I3 is accessible for man ual rotation thereof relative to discs I2 and I4. vrate of 10 amperes per hour for a period of ten hours. The rated dischargev capacity is there In such cases the ?nally computed discharge for any particu lar battery expressed in ampere hours is also an expression of the percent of rated discharge ca pacity. Thus for example a battery having a discharge of 90 ampere hours also has ninety per cent of the rated discharge capacity. There fore the ?nal answer of the disc computer may be considered either as being ampere hours of discharge or percentage of the rated discharge capacity. ‘ Figure 2 is an exploded view of the discs form ure 1. the battery involves ?guring the lapse of time fore one hundred ampere hours. Figure l isa top plan View of a preferred form of the invention. - An object of the invention is to provide a disc computer for use in determining the ampere hour discharge of storage batteries during test operations. Another object of the invention is to provide a disc computer in which a single setting only is necessary to compute the ampere hour discharge of a storage battery during test operations. A further object is to provide a disc computer . By way of illustration but not limitation, the present disc computer is shown as designed for use in connection with tests performed on stor age batteries arranged to discharge at the rate of 10 amperes per hour. To this end ampere hour which may be adjusted to indicate the starting 50 disc I I is graduated from a value of 90.0 progres time of the test and on which the ?nishing time sively in a clockwise direction to a value of 120.0 may be read, and in registration with the ?nish through an arc of 270 degrees. Thus the value of ing time the ?nal answer in ampere hour dis the graduations increase by 10.0 for each 90° of charge. A further object is to provide a disc computer : . clockwise progression on disc II. For conven ience the graduations have been extended coun 2,410,437 3 4 terclockwise beyond the 90.0 mark to a terminal mark of 87.0 and likewise have been extended beyond the 120.0 mark in a clockwise direction to designed for use with batteries which are ar a terminal mark of 123.0. ranged to discharge to the predetermined voltage minimum over a. period of from 9 to 12 hours since minute disc I2 and hour disc I3 are designed Minute disc I2 is graduated through 270 de Cl to cover such a time interval. It is to be understood that the graduations on grees so that each 90° corresponds to an interval the ampere hour disc, the minute disc and the of one hour which is divided into 60 minutes. hour disc may be modified in suitable manner For convenience the graduations are extended to accommodate the computer for use with stor Disc I3 is provided with a series of numerals 10 age batteries having rates of discharge and length of discharge time which differ from the speci?c from one to twelve which may be viewed through illustrations herein, observation opening 22 in disc I4. Rotation of It is to be understood that various modi?ca disc I3 may be e?ected to bring any one of the tions and changes may be made in this invention numerals desired into View through opening 22. without departing from the spirit and scope A similar series of numerals is provided beneath thereof as set forth in the appended claims. each of openings 23, 24, 25 and 26, and these The invention described herein may be man are so arranged that the time interval between ufactured and used by or for the Government of the numeral exposed to view through opening 22 the United States of America for governmental and the numeral exposed through openings 23, 24; 25 and 26 will be respectively 9 hours, 10 20 purposes without the payment of any royalties thereon or therefor. hours, 11 hours and 12 hours. For example as What is claimed is: shown in Figure 1, if disc I3 is adjusted so that l. A computer comprising a pivot, an answer the numeral 10 is seen through opening 22, then disc on said pivot having function graduations the numeral 7 ‘corresponding to an interval of 9 hours will be seen through opening 23. 25 thereon representing a function which varies with time, a minute disc on said pivot concentric To illustrate operation of the computer assume, with said answer disc and rotatable relative for example, that it is desired to compute the thereto and having minute graduations thereon ampere hour discharge of a battery from which in registration with said function graduations, a the following test data has been recorded: 30 masking disc on said pivot for rotation with said Starting time ____________________ __ 10:00 a.m. minute disc and having peripheral openings in Finish time _______________________ __ 7:30 p. m. registration with said minute graduations at 60 Discharge rate __________ __ l0 amperes per hour minute intervals and also having a random open ing, an hour disc on said pivot between and ro Discs I2, I3 and I4 are rotated as a unit until tatable relative to said masking disc and said 35 opening 23 of disc I4 and the corresponding zero minute disc and inscribed with a series of nu minute mark of disc I2 are in registration with merals beneath said masking disc openings the 90.0 ampere hour mark of disc II. Disc I3 whereby when a numeral is exposed beneath said is then manually rotated relative to discs I2 and random opening the numerals beneath successive I4 until the numeral corresponding to the start ing hour of the test run upon the battery may 40 peripheral openings will differ from said random opening numeral so as to successively indicate be seen through opening 22. In the example if an increasing time lapse in hours, an arcuate the test were started at ten o’clock a. m., ad slot in said hour disc, and means extending justment would be made until the numeral 10 through said slot for locking said masking disc showed through the opening 22 as seen in Figure slightly beyond the 270 degree range. 1. Discs I2, I3 and I4 are then rotated as a unit relative to disc II until the number of minutes past the hour corresponding to the exact start ing time of the test are in registration with the 90 ampere hour mark. In the example, since the starting time is exactly ten o’clock a. m. no ad— -. and minute disc together and for limiting rota tion of said hour disc relative to said masking disc and said minute disc. 2. A computer for use in determining the am pere hour discharge of a storage battery compris ing a pivot, an ampere hour disc on said pivot having ampere hour graduations thereon, a minute disc on said pivot concentric with said ampere hour disc and rotatable relative thereto justment of this nature will be made and the zero minute mark of disc I2 will be in registra tion with the 90.0 ampere hour mark of disc I I. and having minute graduations thereon in regis The ?nish time in hours and minutes is then located on the computer, selecting the proper 55 tration with said ampere hour graduations, a masking disc on said pivot for rotation with said hour at opening 23, 24, 25 or 26 and then locating minute disc and having peripheral openings in the correct minute position clockwise therebe registration with said minute graduations at 60 yond on disc I2 as the answer index. In the ex minute intervals and also having a random open ample, with a ?nishing time of 7:30 p, m., the number 7 is seen through opening 23 and the 60 ing, an hour disc on said pivot between and r0 tatable relative to said masking disc and said thirty minute mark clockwise therefrom is found minute disc and inscribed with a series of numer to be the answer index. When the ?nishing time is correctly located on disc I2 as the answer in~ als beneath said masking disc openings whereby when a numeral is exposed beneath said random therewith will indicate the answer in ampere 65 opening the numerals exposed beneath succes~ dex, the graduation on disc II in registration hour discharge of the battery. In the example, sive peripheral openings will differ from said the answer on disc II will be found to be 95.0 ampere hours. random opening numeral so as to successively in dicate an increasing time lapse in hours, an ar It will be apparent that the computer‘is de signed for use in connection with batteries which discharge at the rate of ten 'amperes per hour since the ampere hour graduations on disc II vary by 10 ampere hours for each-hour of vari ation on minute disc I2. cuate slot in said hour disc, and ‘means extending through said slot for locking said masking disc and minute disc together and for limiting rota tion of said hour disc relative to said masking disc and said minute disc. 3. A computer for use in determining the am It will also be apparent that the computer is 75 pere hour discharge of a storage battery which 2,410,437 discharges at the rate of ten amperes per hour comprising a pivot, an ampere hour disc on said pivot having ampere hour graduations thereon disc and said minute disc and inscribed with a series of numerals from 1 to 12 beneath said masking disc openings whereby when a numeral is exposed beneath said random opening the nu from 90.0 to 120.0 through an arc of 270°, a min ute disc on said pivot concentric with said am 5 merals exposed beneath successive peripheral pere hour disc and rotatable relative thereto and openings will differ from said random opening having minute graduations through 270° with numeral so as to successively indicate a time each 90° graduated from 0 to 60, said minute lapse of 9 to 12 hours, an arcuate slot in said graduations being in registration with said am hour disc, and means extending through said pere hour graduations, a masking disc on said 10 slot for locking said masking disc and minute pivot for rotation with said minute disc and hav disc together and for limiting rotation of said ing peripheral openings at 90° intervals in reg hour disc relative to said masking disc on said istration with said zero minute graduations and a random opening, an hour disc on said pivot between and rotatable relative to said masking 15 minute disc. NATHAN W. FELDMAN.