Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 20
in this case be made so long that three or even two pins are sufficient to drive the outer wheel con-tinuously, the whole combination in the latter case assuming a very curious aspect, as shown in Fig.2090 ; the pins turning in blocks which slide back and forth in the two slots at right angles to… … used is that of the involute of the circle. We have seen that any curve carrying a marking-pomt,and rolling in contact with both pitch-circles, may be used to generate the acting outlines of theteeth. Abstractly speaking, that is; for many curves which may be thus generated, although they 12…
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