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 634
Severalof the best known types are given herewith. Fig. 3515 represents one of the oldest and most efficient forms. Cog-wheels, the teeth of whichare fitted to work accurately into each other, are inclosed in an elliptical case. The sides of these wheels turn close to those of the case, so that…
Mechanical engineering -- Dictionaries
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