GB868759A - Improvements in or relating to calculating machines - Google Patents

Abstract

868,759. Digital electric calculating-apparatus. BELL PUNCH CO. Ltd. Sept. 2, 1957 [Sept. 6, 1956; Nov. 22, 1956; July 3, 1957], Nos. 27572/57, 27573/57 and 27574/57. Divided out of 868,753. Class 106 (1). A calculating machine which is basically that described in Specification 868,757, is provided with means for enabling division to be carried out automatically. As shown, Fig. 1, additional conductive commutator segments " H " and " HL " are provided. To effect division, the machine is set for addition and the numerals of the dividend are inserted in the keyboard with the most significant digit in the highest order of keys to enter the dividend into the counting tubes O 10 -Z 10 . The machine is then set for division which causes the tube L to discharge to its " 9 " cathode L<SP>1</SP> 9 the divisor then being set into the highest possible position in the keyboard, actuation of a " divide " key then initiating a division cycle. The valve T 1 is rendered conductive from the condenser U 4 so that as the brush F sweeps over the contacts O 0 to O 8 &c., the complement of the divisor is added into the dividend. If this results in a transfer pulse from the counting tube Z 10 , the valve T 9 is rendered non-conductive to apply zero potential to a contact 4 but if no transfer occurs, the contact 4 is energized to step on the tube L by one digit when the contacts 4-4 are bridged by the brush Fl thus rendering the valve T 2 conductive and T 1 non-conductive. The valve T 5 is thus rendered conductive to apply a potential to the contacts E‹-E‹ which are in advance of the commutator segments Z 9 , Y 9 , &c. which, when the contacts E‹-E‹ are bridged, cause the valve T 8 to conduct, applying a potential to the contacts O 12 -O 21 , P 12 -P 21 ... H 12 - H 21 , and to the contacts P 22 -P 30 ... L 22 - L 30 , the contacts L 12 -L 21 being supplied by the valve T 1 and the contacts O 22 -O 30 from T 7 so that as the brushes F<SP>1</SP>, F<SP>2</SP> move over the contacts, the values in the counting tubes O 10 -Z 10 are transferred and complemented. The " divide " key is depressed for each digit of the quotient required, the quotient digits appearing sequentially in the lowest order. The divide key 400, Fig. 11, is arranged in line with the multiplier keys for " 0 " to " 9," 401-410. When any one of these keys is depressed, a keybar 437 moves an extension 414 to permit a contact blade 416 to open contacts 424, 425 and close contacts 417, 418, the contacts 411 moving with the keys " 0 " to " 9 " bridging one of the pairs of contacts 412, 413, the key being kept depressed by the operator until the result of the operation being performed is indicated. Specifications 868,756, 868,758, 868,760, 868,761 also are referred to.