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 665
where, without the soiling and turf, exposed to the action of tin- weather, they willnot stand. In some cases, where stone is plentiful, and where there is an excess of cutting, sidewalls, similar to Fig. :;.>77. are built, to retain the sides of the excavation,p q showing in that casethe line… … Ballast.—-The road-bed, having been formed to the proposed inclination longitudinally, is leveledtransversely, and is then ballasted. The ballast forms the foundation for the ties upon which therails rest, and its object is to effect drainage. It is obvious that if water were allowed to…
Mechanical engineering -- Dictionaries
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