International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 313
Fig. 402. Fig. 403. of the wall at the base, the center of gravity is lowered andthe stability consequently increased. The backing includedby the lines ^// and ///exerts only vertical pressure againstthe offsets, which tends greatly to prevent the overturningof the wall. RAILROAD CONSTRUCTION. 903…
Railroad engineering
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