Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 214
is only a percentage of the in-sistent force of the body, and this percentage is calledthe coefficient of friction. If the horizontal surface of sup-port be raised at one end, so as to make the surface in-clined, it will after a time become so steep that the insist-ent body will slide down the… … of frictional resistance; or thus (Fig. 395), if the force acting in the direction PM is
Mechanical drawing
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