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 202
Fig. 13. the front give logarithmic numbers, sines and squares, or square roots. Thoseon the back give scale of equal parts, cubes and cube roots. (Fig- I3-l … Fig. 14. 5. Stanley-Boucher Calculator is an improvement on the above by theaddition of a third index hand on the back dial, which indicates the totalmovement of the front dial, so that continuous workings show a final result,either + or —, thus indicating the correct reading of the result. (Fig-…
