Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 89
til the crownline is reached, there reversing its curva-ture and bending the other way until itmeets the other base line. At the baseline it has a cusp, and rises from it torepeat the same course indefinitely. Fig. 143 shows a crown gear or rack. Thepitch line is the great circle igl. The lineof… … Bilgram Bevel Gears. 87 circles are the small circles U and W. Thespherical involutes have the same property ofadjustability as have the spur involutes, the motion being confined to the sphere, and there-fore the gears are adjustable as to their shaftangle, the apex remaining common to both.…
Gearing
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