Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 831
GEERINfr. … It may also be observed, that for every pair of pitch circles an infinite number of pairs of involutes:may be assigned that will answer the required conditions; for the inclination of ETD to the line oicentres is manifestly arbitrary, and every change of inclination mani- 204l. festly produces a…
Mechanical engineering · Mechanics · Engineering
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