Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 208
■y///////y/<V^ Fig. 375. Fig. 376. pendicular, then the weight is not supported by the plane at all, but it is wholly depend-ent on the force P, and is equal to it. Between the limits, therefore, of a level and aperpendicular plane, to support a given weight W, the force P varies from nothing…
Mechanical drawing
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