International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 309
in Fig. 395,of large stones showing on one^1 I ■ - face, but extending only a shortdistance into the wall, while theback and body of the wall arecomposed of small stones. Theback of the wall, having so muchgreater proportion of mortar thanthe front, will in high walls settleconsiderably more than… … I r^ I Fig. 395. Fig. 306. RAILROAD CONSTRUCTION. 899 railroad embankment where the back filling is subjected tothe constant vibrations caused by passing trains, its ultimatefailure is almost certain. A full proportion of large stones should show on bothfront and back and extend well into the wall,…
Railroad engineering
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