Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 341
a radius de equal to c e describe acircle ; the direction of the teeth of the second wheel will be tangents to thislast, as at d. System composed of a Pinion driving a Rack (Fig. 703).—The pitch-lineM N of the rack and the pitch-circle A B D of the pinion being laid downtouching one another, divide… … Fig. 703. the teeth and width of the spaces in the rack. Perpendiculars drawn throughall these points to the solid part of the rack will represent the flanks of the teethupon which those of the pinion are to be developed in succession. The curva-ture of these latter should be an involute A c of the…
Mechanical drawing
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