International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 595
ported byfour logs or rangers laid lengthwise the bent, and cross-tied 1180 RAILROAD STRUCTURES. by short logs which were drift-bolted to the rangers. Thelogs were notched at each intersection, as shown in the de-tail at yl. The tops of the cross logs were adzed at theirmiddle to a common level to… … than a dozen years, no considerable settlement has takenplace. 1746. Cribs may be employed for foundations wherethe ground is very sidling, or they may be used as a sub-stitute for masonry foundations where the line crosses orborders on streams with rapid currents. At such pointstimber and cobble…
Railroad engineering
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