. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . GRAVEL, CINDERS. CHATS, ETC,. CEMENTING GRAVEL AND 112.—Ceoss-sections of Ballast fob Class C Roads. essential feature of such a section is that the soil, which isprobably not readily permeable, should be kept away fromthe ends of the ties. Specifications for the placing of mud bal-last, as well as other forms of ballast, have frequently specifiedthat the ballast should be crowned about 1 inch above the le
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . GRAVEL, CINDERS. CHATS, ETC,. CEMENTING GRAVEL AND 112.—Ceoss-sections of Ballast fob Class C Roads. essential feature of such a section is that the soil, which isprobably not readily permeable, should be kept away fromthe ends of the ties. Specifications for the placing of mud bal-last, as well as other forms of ballast, have frequently specifiedthat the ballast should be crowned about 1 inch above the levelof the tops of the ties in the center of the track. This featureof any cross-section, although proposed, was rejected by theassociation, in spite of the fact that when a tie is so imbeddedit certainly will have a somewhat greater holding power in theballast. 236. Proper depth of ballast. The depth of ballast is officiallydefined by the A. R. E. A. as the distance from the bottom of § 237. BALLAST. 273 the tie to the top of the subgrade. In the recommended sec-tions (Figs. 110 to 112) the depth shown varies from 6 inchesto 24 inches. But the Ballast Committee reported in 1915 asa recommended concl
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
