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 300
fter ten complete revolutions of the rule the reading will hardly be one minuteout—an accuracy that fully answers all practical requirements. The instru-ment is then ready for use. INSTRUMENTS OF CALCULATION 271 XII. Pantographs. (1) Precision-Pantographs. By A. Ott, Kempten, Bavaria. The… … Fig. i.—Precision Pantograph. for any shrinkage of the paper of old drawings, so often met with. The (pantograph consists of a heavy crane-shaped iron standard consisting ofa bow H, a weight B, and a sole plate K. From the top of the standardare suspended, by a couple of thin wires, four bars, 1,…
