Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 212
these pitches is to the circumference described by the power.As the lever (Fig. 389) moves under the action of power or weight, the lever be-comes inclined to the direction of the forces, but the forces are still parallel. The rela-tions of the forces to each other are not changed, but the absolute…
Mechanical drawing
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