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 335
d trucks, which are usually made swing-trucks by a similar arrangementto that above described, and which require a radial bar, as otherwise they would only be pushedlaterally by the curvature of the rails, without moving around the centre, as is necessary in order tohave the axle take a radial… … 2S65. A^k
Mechanical engineering -- Dictionaries
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