Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 381
370 DRAUGHTING DEVICES. lever and pin follows the spacing of the teeth on the wheels. 1531/L DOTTING INSTRU-MENT.—One of the toothedwheels for the kind of dotting re-quired is placed on the pin and heldby the spring clip. The wheelshould roll on the edge of the Tsquare and the frame against…
Mechanical movements
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