Improvements in or relating to electrically operated calculating equipment

Abstract

Abstract 578,041. Calculating - apparatus. STANDARD TELEPHONES & CABLES, Ltd., HARTLEY, G. C., and REYNOLDS, W. J. May 10, 1941, No. 6072. [Class 106 (i)] An electrical calculating-apparatus for performing multiplication in radix two comprises a circuit for obtaining the partial products and circuits for adding the digital values in each denomination including the necessary carryover to obtain the solution. The factors are entered on the terminals I and M, Fig. 1 ; the multiplier relays YU ... YZ and their contacts are operated or not operated according to the value of the digits of the multiplier and the other relays TP ... ZZ operate or remain unoperated in accordance with the digital value of the products of the respective digits The values represented by the condition of the relays are added by the circuit arrangements shown in part in Figs. 2 and 3 and the solution is obtained on lamps. The circuit of the lamp LL for the digit of the 2<0> or lowest denomination is completed by relay ZZ when operated. The circuit of the lamp LK for the next denomination 21 is completed over the back and front and front and back contacts of the relays ZY, XY respectively. If both of these relays are operated no circuit is completed to the lamp, but a carry-over relay XJA is operated to transfer a digit to the denomination 2<2>. In denomination 2<2>, the circuit of the lamp LJ is completed if an odd number of the relays ZX, XX, WX and XJA is operated. The value to be carried over to the denomination 23 is 0, 1 or two digits depending on the number of relays operated. For this purpose, relays XIA and XIB are provided. The circuit of the lamp LI for the 2<3> denomination depends on the four relays ZW, XW, WW and VW and on the transfer relays XIA and XIB. The circuits for the lamps of the higher denominations are arranged in a similar manner with the appropriate number of transfer relays. If it is desired to transfer the result to another circuit, the lamps may be replaced 'by relays. Specification 577,893 is referred to in the Provisional Specification.

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