Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 378
t a distance fromA equal to AD. The shape which the line AC now takes is calleda helix, and the distance AD is called the pitch of the helix. If 334 MECHANISM. 27 we choose another point, 11, half-way between A and I), jiiid dvnwa line IIJ parallel to AC, this line when wrapped around the cyl-inder… … I234.56?<9I0III2I Q Fig. 27. parallel to AC be drawn from each of the points of division, wewould have on the cylinder three parallel and equidistant helicesof the same pitch, or a triple helix. Ficr. 20 shows a single ritrlit-hand helix, Fig. 27 a single left-hand helix. Fig. 28 a double…
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