Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 296
J Fig. 614. Fig. 615. with the interior conical surface of a; this should be done gradually; thesurfaces of the two cones slip on each other till the friction overcomes theresistance, and motion is transmitted comparatively gradually and withoutdanger to the machinery. The longer the taper of the…
Mechanical drawing
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