Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 60
OR.—The curved slot is made proportionalto the length of the two arms of the pencil lever. 155. AMSLERPLAN-IMETER.—E is the fixedpoint; F the tracer. Thedisc has a sharp edge anda cylindrical section dividedand read from a vernier scale.a worm screw and indexwheel indicate the number of revolutions…
Mechanical movements
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