Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 300
Fig. 625. Fig. 626. Fig. 627. Fig. 628 represents a portion of the elevation of a pulley sufficient to showthe proportion of the several parts, and Fig. 629 a section of the same. Theparts may be compared proportionately with the diameter of shaft; thus the
Mechanical drawing
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