Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 380
late ofglass in a frame on a drawing board.The picture on one side and a plainsheet of paper on the other side ofthe glass. On looking into theglass on one side the picture isplainly projected on the other, andcan be readily traced with a pencil. 1531^. SELF REGIS-TERING BAROMETER.—Four aneroid… … 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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