Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 116
appears that the most Fig. 10. favorable condition is secured by making the generating circles large as possible. Again the generating circles, when situated as in Figs. 9, 10 and 11, form the path of the points of contact in their journey from the point of beginning, to the point of quitting… … indicates that the teeth are very much The rolling circles being smaller than
Engineering
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