The practical draughtsman's book of industrial design and machinist's and engineer's companion : forming a complete course of mechanical, engineering and architectural drawing (1866)
Armengaud, M. (Jacques Eugène), 1810-1891, Armengaud, M. (Charles), 1813-1893, Amouroux, M. (Jules), Johnson, William, 1823-1846 · Philadelphia : H.C. Baird · leaf 204
ing-point, p, to which the handle, h, isattached by a universal joint. The frame, f, also carries a wheel, i,which, by means of a weight, is pressed on the surface of thecone, and receives motion from it as the tracer is carried along the paper. The index-wheel, i, only touches the cone by a… … these divisions is the T J5th part of a square inch ; so that one turnof the wheel represents 20 inches. Another index-wheel, T,moved by i, is divided into five parts, each of which represents20 inches, so that a complete revolution of T values 100 inches.The eye-glass, e, assists in reading the…
