International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 311
the foot, which gives the wall a more sub-stantial appearance, though clearly adding nothing to itsstability. Earth and sand are the materials commonly used forbacking. When broken stone,gravel, boulders, or clay areto be used, additional weightmust be given to the wall. By inclining the base A Bof… … RAILROAD CONvSTRUCTlON. 901
Railroad engineering
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
