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 336
tender-trucks differ from engine-trucks principally in having outside axle-journals and no swing motion.They are either of wood or of iron, and are represented as of iron in the engravings. To apply inthis instance the principle of the three-point support, the trucks are often so arranged that the… … Many engineers prefer to have both trucks side-bearing. This 2?68. and the second the side-bearin^is a safer arrangement, as in casea wheel of the first truck shouldbreak, the side-bearings will pre-vent it from tipping down. Thetender axle-boxes are similarlyconstructed to those of a car.(See…
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