Patent GB-490869-A (GB)
Title: Improvements in or relating to calculating machines
IPC: G06F7/46
Filed: 1937-04-22
Abstract: 490,869. Statistical machines. ELECTRICAL RESEARCH PRODUCTS. Inc. April 22, 1937, No. 11494. Convention date. May 13, 1936. [Class 106 (i)] A machine controlled by code cards has members capable of sensing two factors of a problem concurrently, relays controlled by the sensing members for setting up electric circuits according to the sensed digits of the two factors, and computing mechanism under the control of said electric circuits for performing the computation of the problem. In the multiplying machine shown, each card is punched with a multiplier and may or may not have a multiplicand punched also. When a multiplicand is punched, this field bears a special hole 23 which causes the retention of that multiplicand (switch 4 in full line position) in the machine for use as a common multiplicand for following cards until the sensing of the next special hole sets up a new multiplicand. If desired, the special hole may be in the multiplier field. Each code card 6 is fed along the line of the columns and from left to right in Fig. 1, until it reaches the card stop 201. There are two pinboxes 5 for the multiplier and multiplicand fields of the cards respectively. Each pinbox includes four columns of pins 11, 17. In each column, the five pins 11 read the hole positions of the half column of the code card and the single pin 17 rests on the conductor bar 20 when the pins 11 are on the hole positions. There is a separate bar 20 for each of the four columns. The single pin 14 is shown only for the multiplicand field and reads the special hole 23 therein which denotes that a multiplicand is punched in that card. Pin 14 coacts with a separate conductor piece 24. A pin 31 is raised. by the card material to close card contacts 30. When a multiplicand is read., the pin 14 completes a circuit 61, Fig. 2, 24, 14, 62, 63. Relay 62 then connects the grounded battery 63 over its left-hand, or make contact, to the winding of a slow release relay 64 and to ground. at 65. Shortly after pin 14 meets piece 24, the pins 11 make contact through any holes and the corresponding multiplicand relays 68 are energized over parallel circuits 65, right-hand contact of relay 64, denomination-suppression keys 70, 17, 20, 11, the upper closed contacts of relays 68, left-hand contact of relay 64 and battery 63. With switch 47 in the full line position shown, ground at 71 is connected through the switch to the left-hand make contact of the energized relays 68 to hold these relays energized through their left-hand make contact and winding, and left-hand make contact of relay 64, to battery 63. The energized relays 68 thus remain energized until the relay is again energized (by a hole 23 in one of the following cards) after having been energized and de-energized. The multiplicand is thus stored for common use with the multipliers on the following cards until a special multiplicand hole 23 is again sensed on a subsequent card. Four sets, each of five relays 68, are shown in Fig. 2, the top right-hand set of five being for the units, the top left-hand set being for the hundreds, &c. In the code, Fig. 4, the numerals 1; 3, 5, 7, 9 are represented by a single hole and the numerals 2, 4, 6, 8 by single holes plus a " 9 " hole. If, for example, the " 1 " relay 68 alone. in a set is energized, a connection representing numeral 1 is transmitted to the multiplying commutator,. but if the " 1 " relay 68 and the " 9 " relay 68 are energized (numeral " 2 ") then a connection to the commutator is made, representative of numeral 2. The multiplicand circuits are continued to a stepper switch 80, Fig. 3 (not shown). The multiplier is read off the card in the pin box 5 at the top right-hand corner of Fig. 2 and the circuits are carried to nine multiplier relays 91, Fig. 3 (not shown). Multiplication is effected and the partial products are transmitted to an accumulator as set out in Specification 348,043. The final product may be shown on a visual indicator or might be punched in statistical cards by the mechanism described in Specification 455,331. If it is desired to use the machine for a run of cards in which each card bears both a multiplicand and a multiplier, switch 47 is moved to its dotted line position. If the multiplicand has less than four digits, the appropriate denominationsuppression keys 70 are opened.