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 753
of true screws. It is so constructed as to revolve in a cylindrical space in the dead-wood of the ship,and has the corners rounded off. It is cast in one piece. The Hirsch screw, Pig. 3790, is one whose pitch varies both radially and axially. The blades areso shaped that the corner of the acting…
Mechanical engineering -- Dictionaries
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