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 153
Fig. i.—The Keyboard. … 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…
