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 22
2094. … line of action should be no greater than in the case of two wheels, and the appearance of a workingrack and wheel of this construction is shown in Fig. 2094. It may be added that it is possible also to construct annular gearing with involute tooth-lines ; butthe fact is of no practical importance,…
Mechanical engineering -- Dictionaries
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