Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 326
NS. 309 Fig. 678. Both involutes in Fig. 683 start from the point of contact E, henceone curve is described forward, the other backward. Thus on the normal E E there are eight parts, and from the commencementof the next normal seven parts are marked off, the next six, and so on untilfinally the… … Fia. 683. A pinion gearing into a rack is shown in Fig. 684. The faces of the teeth ofthe rack can be taken at an angle of 23° with the perpendicular; this anglegives the longest line of contact, which may be considered the jDitch-line of therack, and, the pitch-circle of the pinion being…
Mechanical drawing
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