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 201
Fig. 11. 2. Fullers Rule consists of a cylinder movable both round and parallelto its axis on a cylindrical stock to which a fixed index and a handle areattached. Another cylinder capable of telescopic and also rotational dis-placement lies within the stock and carries another index. A… … Fig. 12. numbers on the scale are read on a scale of equal parts on the upper edge of thecylinder, in conjunction with the upper index. Tables of trigonometricfunctions are printed on the stock. Calculations are correct to 4 and some-times to 5 figures. (Fig- I2-)3. Barnards Calculating Rule,…
