Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 307
pulleys, andhence driving may occur in either direction. Usually, however, it is requiredto provide for motion in but one direction, in which case the second form isused as being simpler. The pulley B may be used as one of the guide-pulleys,in which case it may be placed loose upon the same shaft…
Mechanical drawing
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