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
on the stock. Calculations are correct to 4 and some-times to 5 figures. (Fig- I2-)3. Barnards Calculating Rule, similar to Fullers, but the logarithmicscale is repeated twice and occupies in all only about one-third of the helix.The upper part of the helix carries a sine scale. Logarithms of… … 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
