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 24
hall be thehelix E F; then that upon the upper will be the helix E G, the axial advance being the same, butthe perimetral travel being at rates which are to each other inversely as the diameters of the cylin-ders, since the arcs whose projections are L F, L G must be equal in length by the mode of…
Mechanical engineering -- Dictionaries
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