Patent GB-428391-A (GB)
Title: Improvements in or relating to statistical, calculating or like machines
Filed: 1933-11-13
Abstract: 428,391. Calculating - machines. BRITISH TABULATING MACHINE CO., Ltd., Victoria House, Vernon Place, Southampton Row, London. Nov. 13, 1933, No. 31614. Con. vention date, Nov. 14, 1932. [Class 106 (i)] Statistical machines total and sub-total taking.-A multiple-denomination counter is combined with a reading-out device for representing the amounts registered in the denominations to a common scale, measuring means (ammeter 15) for summing the representations and a recording member (20) which is so displaced as to record the sum by a diagram. The invention is described as applied to a machine of the kind set out in Specification 247,200, [Class 106 (i)], and having counters as in Specification 356,304, so that for each denomination the brush pair 11, Fig. 1, which is geared to the corresponding counter wheel, takes up a position on segments 8 corresponding to the number on the wheel. Parts 11 and 8 constitute a reading- out device. The grouped cards are read by upper and lower brushes UB, LB. Three denominational brush pairs 11 are connected in parallel to a line 35 through resistances 13a ... 13i which are individual to the segments 8. For the units U the values of the resistances are such that the total resistance in circuit, with the brush 11 on any particular segment, is inversely proportional to the number represented, i.e. the current for the units is directly proportional to the units digit. For the tens denomination T, the individual resistances 13a ... 13i are one tenth of the corresponding individual resistances of the units, so that the current passing for a tens digit is ten times the current for the corresponding digit of the units. Similarly the resistances in the hundreds H are one hundredth of those in the units. Hence the total current passing to line 35 is directly proportional to the threedenominational number which is registered. For a particular voltage, resistance values are given such that the number of milli - amperes in the current is equal to the number registered. Line 35 is connected to the moving coil 14 of an ammeter 15, the armature 16 of which moves against a spring 19 and carries a marker 20 in contact with the record sheet 21. This sheet has perforated edges for feeding by wheels 40 (only one is shown) on shaft 41. Cam contacts 23 and 29, Fig. 1, are actuated when the tabulator motor TM is running and contacts 24 and 28 when the reset motor is running ; so that with switch 25 on contact 27, progressive totals are marked by member 20 once each card cycle, and with switch 25 on contact 26 a total is marked at each card group change. Whichever pair of contacts is used, when coil 14 is energized to mark a vertical upward line or sheet 21, coil 22 is also energized to retract the pawl 44 one tooth over ratchet 42 on shaft 41, pawl 44 being carried by the armature 45. After the vertical line is marked, coil 22 is de-energized and pawl 44 feeds shaft 41 and sheet 21 one step so that a short horizontal line is marked. Thereafter, coil 14 is de-energized and a vertical downward line is marked to complete the record for the number.