Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 350
Fig. 719. Fir;. (Fig. 719). The pressure is applied to the disk wheel, and is so arranged thatit can be shifted along its axis for a variable speed motion. The surfaces in contact are limited, the diameters, therefore, shouldbe as large as possible, with high velocity. Another variable speedgear is…
Mechanical drawing
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