Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 30
THE MECHANICAL POWERS. 21 … 19. Revolving Lever, first order.W = P X ^ P = W X ^ p 20. Revolving Lever, second order. W = P X {a + ^) a-\-b 21. Revolving Lever, third order. W = P X b a -\- b^ P = W X (« + ^)
Mechanical movements
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