Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 377
1528. PANTOGRAPH.—For perfect pro-portions the points A, B, C must always be inline. With the point B fixed, the pencil at Awill produce an exact copy of tracing frompoint C. By changing places for the fixedpoint a double or half-size tracing may be made. 1529. LAZY-TONGS PANTOGRAPH, for reducing… … DRAUGHTING DEVICES. 367
Mechanical movements
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