Thomas, Hugh Kerr · New York, McGraw-Hill Book Company, Inc.; [etc., etc.] · leaf 61
Younger has supplied the following means of obtain-ing the value of /3. The length of the worm g is a multiple n of the circularpitch P, and it contains in its length a certain number ofthreads n of which it is most important to take the fullest pos-sible advantage. In order to ensure this, it is… … Fig. 20. Let A 5 in Fig. 20 be the length of the worm = g; AC k theoutside circumference of the worm. From the point A, ADis drawn so that the angle DA C =a. From 5, the Ime BEis drawn perpendicular to AD. The distance A E is the lengthof the arc of the worm which must be subtended by the wormwheel…
Gearing, Worm
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