International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 301
cture may be sufficiently distributed. The firstcourse of masonry should project at least G inches outsidethe ma.in body of the abutment for the same reason, andshould be composed of much larger stones than those whichform the main body of the superstructure. The paving be-tween the abutments and… … at A, in a culvert of IG feet span, should be from 0 inches to12 inches thick. 1472. Concrete.—The concrete for the foundationsshould be composed of the following ingredients: Cement,1 part; sand, 3 parts; broken stone, 5 parts. If the con-crete is to be deposited below the water level,…
Railroad engineering
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