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 230
rection of the base isunlimited. This instrument can consequently in one operation measure areasof unlimited length and of a width equal to the length of the tracer arm used. With the rolling-sphere planimeter the measuring roller performs exclu-sively rolling movements on the surface of an… … Fig. 10.—Rolling-Disc Planimeter, with gliding movement of the measuring roller. 202 SECTION G
