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 374
2923 … of the vertical plane of the piece C. Its other end carries a friction-roller J, which, working inthe curvilinear space c of the piece C, forces this, and consequently the frame B, to recede fromthe perpendicular or to return to it, according as the cross-bar F is in the top or bottom of itscourse,…
Mechanical engineering -- Dictionaries
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