Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 154
Fig. 2.—The Keyboard, showing the Multiplying Device. CALCULATING MACHINES 129 seconds, and fractions. Its full capacity is shown by the figures 999 59™59s999 9999 9- Within these limits it will work to any degree of accuracyrequired, great or small. It will also record the result either to that… … Fig. 3.—The Multiplying Device. in the result. This feature is of obvious utility in table-making. Themachine will subtract as well as add. In particular, the machine fulfils the special purpose for which it wasdesigned, namely, the production of serial quantities (for example,…
