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 37
in Figs.2129 and 2131 has teeth of the involute form, the meridian section of the screw being therefore arack with sloping teeth, and the screw- itself a true oblique helicoid; and such a helieoid it willalways be, whatever the diameter or number of threads: the outlines of these threads or teeth… … 2132
Mechanical engineering -- Dictionaries
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