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 158
r mathematics generally,the same machine writing an ordinary letter in any language. Greek, Turkish, Persian, Punjabi, Xagari, Arabic, Sanskrit, and manyother Oriental languages are included. Where necessary the carriage operatesin the reverse direction at the touch of a button. It may be thought… … Fig. 2. Barrett Adding Machine The portable Barrett Adding and Computing Machine represents oneof the most recent developments in calculating machines. It is simple inconstruction and claims to have 1100 parts less than the nearest competingmachines. No skilled operator is required, and the extreme…
