Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 82
hich the generatingcircle rolls must be equal in length to the circumfer-ence of the generating circle. As it is somewhat diffi-cult to get this length correctly, an approximate method,as follows, may be employed: Divide the generating circle in equal parts, just aswas done in the case of the… … FiG.28
Mechanical drawing
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