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 41
and the two wheels are exactly alike inevery particular. The axes are not in thesame plane, but situated like those of thecommon worm and wheel; that is to say,their projections upon a plane parallel toboth intersect at right angles, and the lengthof their common perpendicular is equal tothe…
Mechanical engineering -- Dictionaries
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