International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 290
he embank-incnt at center line. Box culverts are gen-erally constructed of dryrubble masonry. Thestones in the abutments(also called side zualls, andhaving a height of 3 ft., inFig. 384) should be ofgood size, faced with bedsroughly dressed and laidwith joints well broken.Binders reaching… … 880 RAILROAD CONSTRUCTION. and with faces dressed so as to insure a complete cov-ering. Mortar is used at the discretion of the engineerin charge. The parapet, 1 ft. thick, is laid on the coveringflags. In soft, marshy soils, a 1-foot paving will not afford a se-cure foundation, especially if…
Railroad engineering
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