. Railroad structures and estimates . Brake Coupling FRONT ELEVATION BACK ELEVATION. PLAN Fig. 244. Steam, Air and Water Connections for Engine Houses. ELECTRIC WIRING AND LIGHTS. 527 ground on the outside, and excessive heat inside, it soon rotsout, and has to be renewed every few years. To ehminate the maintenance charges entirely, it is neces-sary to build the ducts of concrete or masonry, or such materialas will be permanent; and to be successful it is also necessarythat its cost will compare favorably with the price of wood. The Thurber patented system of rib concrete ducts issaid to acco
. Railroad structures and estimates . Brake Coupling FRONT ELEVATION BACK ELEVATION. PLAN Fig. 244. Steam, Air and Water Connections for Engine Houses. ELECTRIC WIRING AND LIGHTS. 527 ground on the outside, and excessive heat inside, it soon rotsout, and has to be renewed every few years. To ehminate the maintenance charges entirely, it is neces-sary to build the ducts of concrete or masonry, or such materialas will be permanent; and to be successful it is also necessarythat its cost will compare favorably with the price of wood. The Thurber patented system of rib concrete ducts issaid to accomplish this result, and the method of installation isas follows: The msLin ducts carry the steam, air, water and heating pipes,run between and connect each engine pit, either at the front orback of the house, making a continuous passage throughout,so that no breaking or cutting of walls for the passage of pipes isnecessary; they are made 2 ft. 9 in. wide and 2 ft. 9 in. deep. The ducts carrying the branch steam, air and water pipes con-nect with the main duct between alternate pi
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