Electronic calculating machine

616,962. Calculating-apparatus. BRITISH TABULATING MACHINE CO., Ltd. Sept. 26, 1946, No. 28776. Convention date, Sept. 27, 1945. [Class 106 (i)] A multiplying apparatus has storage devices for a first factor, a second factor, and a product, respectively, and is characterised by each storage device b...

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Zusammenfassung:616,962. Calculating-apparatus. BRITISH TABULATING MACHINE CO., Ltd. Sept. 26, 1946, No. 28776. Convention date, Sept. 27, 1945. [Class 106 (i)] A multiplying apparatus has storage devices for a first factor, a second factor, and a product, respectively, and is characterised by each storage device being a valve counter adapted to advance by one on receiving an impulse, means for setting the first and second factor storage devices to represent two factors respectively to be multiplied together, an impulseoperated valve cycle counter, a source of impulses, means for transmitting impulses from the source to the second factor storage device, means controlled by the cycle counter for applying an impulse to the first factor storage device each time a cycle consisting of a predetermined number of impulses is counted by the cycle counter, means operated by the first factor storage device for controlling the number of impulses transmitted to the second factor storage device and means operated by the second factor storage device for controlling the number of impulses transmitted to the product storage device. In a first embodiment, cards fed from a hopper R, Fig. 1, carry representations of a multiplier and a multiplicand which are sensed by brushes 13 and entered into respective valve counters by series of impulses corresponding in number with the digits sensed. The machine control is arranged so that there is a card feeding cycle followed by a cycle for carrying out multiplication during which cards are not fed. Multiplication is performed by metering a series of groups of high speed pulses into a product storage device, the number of pulses in each group being determined by the multiplicand storage device and the number of groups being determined by the multiplier storage device, the different denominations of the multiplier storage device controlling the pulse transmission in succession. In this manner a product is entered into the product storage device which then controls punches 26 through magnets PM to punch the result in a card fed with an intermittent motion from a hopper P. Means are provided to ensure that the feeding of cards in the two sections keeps in step, the machine being stopped automatically if not. Trigger circuits. The apparatus comprises a number of trigger circuits of the type described in Specification 609,502. A unit is shown in detail in Fig. 3, and similar units are indicated throughout the circuit diagrams by small rectangles showing on