International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 407
another door, which is closed when the air lock atthe surface is removed for adding another section to theshaft. One of the shafts is used for admitting men andtools, the other for removing material. The air lock usedin removing material is provided with a windlass, the axleof which has air-tight… … Fig. 472. RAILROAD CONSTRUCTION. 997 caisson chamber is utilized in blowing out the sand or any-fine material excavated in sinking. 1567. Plan of Caisson.—A general plan of a timbercaisson is shown in Fig. 473, in which G represents theplan; //the longitudinal section, and K the cross-section.The…
Railroad engineering
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