Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 307
Fig. 646. 290 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. plan of another arrangement of pulleys and guide-pulleys\ ah is the intersec-tion of the middle plane of the principal pulleys. Select any two points a andb on this line, and draw tangents ac, b d^ to the principal pulleys. Then c ac y
Mechanical drawing
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