Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 205
sitions of the three forces, the weight, W, thepower applied, P, and the fulcrum, or support or turning-point, F, of the lever. Thetwo extreme forces must always act in the same direction; themiddle one must act in the opposite direction, and be equal tothe sum of the other two; and the magnitude…
Mechanical drawing
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