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 34
describinghvperboloid externally tangent to the vertical pitch-surface, it will be internally tangent to the other,and vice versa. In the case of external tangency the axes are on opposite sides of the common ele-ment; but the case of internal tangency, in which they arc on the same side, may be…
Mechanical engineering -- Dictionaries
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