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 (1871)
Armengaud, Charles A., 1813-1893, Armengaud, Charles, 1813-1893, [from old catalog] joint author, Amouroux, Jules, [from old catalog] joint author, Johnson, William, 1823-1864. [from old catalog] · Philadelphia, H. C. Baird · leaf 204
g-point, p, to which tiie handle, n, isattached by a universal joint. The frame, f, also carries a wl»«el, i,which, by means of a weight, is pressed on the surface of thecone, and receives motion from it as the tniccr is carried along the paper. The index-wheel, i, only touches the cone by a… … these divisions is the t Jjfth 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, f., assists in reading the…
Mechanical drawing
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