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 758
axis the element revolves through different angles.This expansion is usually assumed to occur according to the law of falling bodies; if, therefore,we develop this helix on its tangent-plane, we produce a parabola. Only one blade is shown in Figs. 3806 to 3809; the others can be laid out by3806- ,…
Mechanical engineering -- Dictionaries
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