International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 409
ivision walls. Struts Y of 12 X 12timber placed at intervals of about 8 feet insure lateralstiffness, and 2-inch iron tie-rods Z fitted with turnbucklesprevent the walls from spreading. The deck consists of six courses of 12 X 12 timbers solaid as to render the chamber as nearly air-tigfit as… … RAILROAD CONSTRUCTION. 090 caisson. A layer of zinc enclosed between two layers offelt is laid over the entire ceiling course and ceiling, andfloated with pitch. The timbers are laid close, with jointsfilled with pitch and fastened to the walls with heavy anchorbolts. Course B is laid diagonally to…
Railroad engineering
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