Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 347
ceas possible to its action. Inthis kind of gearing it is al-most invariably the screw thatimparts the motion. A screw is designated asright or left hand, according asthe forward motion is impartedby turning the screw to theright or left. In the proportions adoptedby the Yale & Towne… … Fig. 711. Fig. 712. adapted for economy of power. In the wheel the teeth in section are those ofa spur wheel, cut with a chasing cutter, and in the screw turned in a lathe. Figs. 709 and 710 are two views, worm and wheel, with such lines of con-struction dotted as will explain the manner of drawing.
Mechanical drawing
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