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 23
ents will become helices. If the lamime be of sensible thickness, we shall have what arc calledstepped wheels, those which are fixed upon the same axis, and constitute practically one wheel, beingyet essentially distinct wheels in different phases of action; nor is this fact altered by any…
Mechanical engineering -- Dictionaries
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