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 666
them in heaps to fill their interior, and through holes in their upper surface small ballast is rammedin to pack them close. Cross tie-rods are used to maintain the gauge. Rolled iron sleepers are madeeither as cross or longitudinal sleepers. Numerous systems of these were exhibited in Paris in…
Mechanical engineering -- Dictionaries
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