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 388
SCIENTISTSAUTOMATICTYPEWRITER No knowledge of type-writing required. 300 changes of type in 30 languages all Oil OI\e machine. Instant change by mere turnof a knob. Writes any formulae inmathematics or chemistry.180 different characters onmachine at one time. J?sk for Catalogue 17, describing The… … This MachineAdds & Calculates T O do a large volume of calculating by mental process is rapidlybecoming obsolete—it is too expensive a method for these days ofkeen competition. It has been demonstrated over and over again that the Comptometer is themost economical, speedy, and accurate means of…
