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
meter ; but only onetype—the polar planimeter—is in common use. The first polar planimeterwas put on the market in about 1854 by Amsler, and his machine of thepresent day is practically the same as the original one. An illustration ofan Amsler planimeter is given in fig. 1, and a diagram indicating… … l-IG. I. Recording Whee
