The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing. (1857)
Armengaud, aîné (Jacques-Eugène), 1810-1891, Armengaud, Charles A., 1813-1893, Amouroux, Jules, Johnson, William, 1823-1864 · New York : Stringer & Townsend · leaf 204
the tracing-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… … these divisions is the -j-loth 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…
Mechanical drawing
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