Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 306
Fig. 644. Fia. 645. are at a and h. The arrangement gives an open belt when the angles betweenthe planes of the pulleys = 0°, and at cross belt = 180°. In the intermediatepositions a partial crossing at the belt is pro-duced, the angle = 90°; the belt is quartertwist (Fig. 645); if = 45°, it is…
Mechanical drawing
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