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
2132 … the screw-like action if placed in gear with the axes in different planes, the fact remains that thevelocity ratio will not be truly constant. In all screw-gearing proper, it must be kept in mind, thescrew or worm, whatever its size or the number of its threads, is a rack, which virtually advances…
Mechanical engineering -- Dictionaries
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