Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 160
Fig. 6.—Developed helical gears. … Fig. 7.—Normal helix of a worm. The two methods of changing the speed ratio shown in Figs. 8 and9 may be combined. That is, part of the desired change in speed maybe obtained by changing the diameters of the gears and the remainderby changing the angle of the hehx. Given the speed ratio and…
Machine design
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