Patent GB-190911650-A (GB)
Title: Improvements in Calculating Machines.
Inventor: CORDT HUGO
Filed: 1909-05-17
Granted: 1910-02-17
Abstract: 11,650. Cordt, H. May 17. Multiplying and dividing apparatus.-The machine operates, for instance in the case of multiplication, by the passage therethrough of selected multiplying-plates corresponding in order to the digits of the multiplier, each plate being provided with series of teeth corresponding in number and arrangement to the multiplication table for the digit represented by that plate. Thus the multiplying-plate corresponding to the digit 8, Fig. 1, is provided with an uppermost row of 8 teeth corresponding to the product of 8 and 1. The second and third rows contain 1 and 6 teeth respectively, corresponding to the product of 8 and 2, and so on. The multiplicand is set in the apertures 16 by means of figured slides 5 provided with knobs 6, and the setting of any digit in the multiplicand positions two axially movable receiving-wheels 3, 4, displaced relatively to one another the distance between any two consecutive rows of teeth on a multiplying - plate, corresponding respectively to the tens and units. When the multiplicand is set, and a multiplying-plate inserted in the guideway, Figs. 1 and 5, and passed through the machine from right to left, the teeth on the plate corresponding to the product of the multiplying-factor represented by the plate and the digits of the multiplicand in succession, operate the receiving-wheels 3, 4, the wheels 3 being operated by the units teeth, and the wheels 4 by the tens teeth, in those cases in which two rows of teeth are necessary to represent the product of the two digits. The tens receiving - wheel 4 of any denomination is suitably connected to the units receiving-wheel of the next higher denomination. and all the wheels are geared to the totalizing-counter. Transfer-mechanism is provided and is adapted to be set by cams 11 on the numeral-wheel shafts so as to effect a double transfer. Cams 11, Fig. 7, at transfer, rock escapement-devices 22 through connexions 19, 20, 21, thus permitting spring- controlled bars 24 on which are mounted the transfer receiving-pinions 30 to be depressed one step, or, if a double transfer is to be registered, two steps. The operation is, however, effected by transfer teeth on the multiplying-plate, either the single tooth 33, or the pair of teeth 34, engaging with the transfer receiving-wheels 30. Overthrow is prevented by two-armed levers 38, which are engaged by a bevelled lug 37 at the back of the plate, and, at the end of each operation, lock toothed wheels 36, Fig. 5, on the shafts 1, 2. Adding and subtracting.-In addition and subtraction, the plate corresponding to the digit 1 is used throughout, the necessary reversal for subtraction and division being performed by means of the reversing-bar 48. Indicating-apparatus showing the multiplying- plate employed is operated by the uppermost row of teeth on the multiplying-plates, which engage with one of two special receiving-wheels, not shown. These wheels are geared together and are also connected by means of a lever with the reversing- bar 48. In addition and multiplication, the digit corresponding to the plate used appears on the indicator ; in the case of subtraction and multiplication, the indicator is first set up to show this digit, which is reduced to zero if the correct plate is used.