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 673
LTD U L7 crown nnnnnnnnnnnrunnn on n … movable rails of the siding. B is a grooved rail with a point fitting to its stock-rail A, and B isgradually elevated above the rail A to a height sufficient to allow the wheel-flanges to clear the railA. The two switch-rails, which are tied with rods, are acted upon by the weighted lever L.…
Mechanical engineering -- Dictionaries
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