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 236
l-IG. I. Recording Whee … Fig. 2. arc about O, while the tracing point P is being guided round the area. Thereading of the wheels on the tracer arm AP is noted before starting, and againafter the tracing point has been guided completely round the boundary of thearea. The difference between the two readings is a measure of…
