This full-keyboard direct multiplication non-printing electric calculating machine has an iron and steel case painted black, The nine columns of plastic black and white keys are colored according to ...

In 1895, Otto Steiger, a Swiss citizen residing in Munich, obtained a U.S. patent for a calculating machine that would multiply a number by a single digit directly, with only a single turn of a crank.

SCIENTIFIC computing has been materially aided of late years by the development of calculating machines, a development in which scientific workers themselves have had a say. We may instance the use of ...

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APART from the many excellent brochures issued by the leading makers of modern calculating machines, there is very little scientific literature on the subject. This is somewhat strange in view of the ...

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