A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)
Brande, William Thomas, 1788-1866, Cauvin, Joseph · New York : Harper & brothers · leaf 1318
all space, which spacewill represent the virtual velocity ok the point; then thesum of the forces, multiplied each by the space which thepoint to- which it is applied describes in the direction ofthat force, will be always equal to zero or nothing, regard-ing as positive the small spaces described… … points of application of the three forces F, F, F, actingon the lever B A C, in the directions P a, P Q.~T Q.,which are all supposed to be comprised in the same plane.Suppose the lever to describe an infinitely small angleabout the fulcrum A, so that the points P, P, P come intothe- positions p,…
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