Patent GB-702251-A (GB)
Title: Improvements in or relating to record card controlled accounting machines
IPC: G06F11/10
Filed: 1951-07-17
Abstract: 702,251. Statistical apparatus. COMPAGNIE DES MACHINES BULL. July 17, 1951 [July 20, 1950], No. 16975/51]. Class 106 (1) For the automatic calculation of a checking symbol accompanying a number recorded by marks in the column of a record card for accounting machines, a device associated with such an accounting machine comprises two electrical calculators with several different channels for introducing the impulses derived from a sensing of the digits of the recorded number into the calculator which attributes to the digits a factor, termed weight, independent of the factor attributed by the other calculator and different according to the column for a series of columns, and which multiplies the value of each of the sensed digits by the weight attributed by the calculator to the column in which the considered digit is present, and which further adds together all the subproducts thus formed, without carry-over, and subtracts from the result of this addition the greatest whole multiple of a basis number n different for each calculator so as to obtain a symbol which, by combination with the symbol calculated by the other calculator, gives the check symbol wanted. It has previously been proposed for the purpose of automatically controlling the transcription of any number on the record card, to add a symbol to the number recorded. This symbol makes the whole number obtained by the juxtaposition of the recorded number and its symbol a multiple of eleven. The invention relates to apparatus employing the combination of two separate arrangements of the foregoing type, in which n1 and n2 are of the form 2k-1 or in the preferred form of the invention n1=3 and n2=7. The apparatus according to the invention comprises (i) a first cyclic totalizer on the basis of n into which is entered one of the starting terms of the operation, e.g. multiplier (ii) a second similar totalizer for the other starting term, e.g. multiplicand, (iii) a third similar totalizer for the result term, e.g. product, (iv) a member effecting on the figures entered in the first two totalizers on operation parallel to the main operation while extracting the largest possible multiple of n, (v) a member comparing, e.g. by subtraction the result supplied by this member to the figure indicated by the third totalizer member and actuating the utilization means. Fig. 1 shows, diagrammatically the essential elements of the calculator comprising a counter C feed the multiplier X, Fig. 4b. The adds successive products on the base 7, deducting a multiple of 7 which is as large as possible. The card passes between a cylinder 13, Fig. 4c, and brushes b1 1 to b12. Each of the columns in a card in which there is a perforation excites one of the relays 21 to 32 according to the time of the impulse. A positive voltage arrives through a cam C1 at 15 at the right hand end of the circuit and passes into a chain of contacts in a leftward direction. If none of the relays is excited the voltage passes to 40, if one of the relays is excited the voltage will be displaced to one of the conductors 40 to 46 the extent of the displacement being that of the figure value of the congruence corresponding to the line of the excited relay. If two relays are excited simultaneously, the displacements are added cyclically, e.g. two displacements of 4 give 1 equivalent to 8-7. The lines 40 46 leaving the counter C feed the multiplier X, Fig. 4b. The multiplier is fed by ten lines 50 to 59 which in turn receive their positive voltage from the distributer Dr of the accounting machine. The lines 50 to 56 feed relays 60 to 66 which are excited in synchronism with the "points" of the card sensing device. In the multiplication there is no carry-over, and the multiplication is cyclic to the base 7, e.g. 3 X 3 gives 2 as the result. The register S, Fig. 4a, selectively receives voltages on -relays 81 to 84 and is operated on the binary system. Thus, the relay 81 represents the value 1, 82 the value 2, and 84 the value 4. The figure obtained on the terminal 110 is combined with a similar figure obtained on another base for example 3 either by addition or by a correspondence table in order to form a letter, for example for giving the final symbol. Specification 702,214 is referred to.