Radford's cyclopedia of construction; carpentry, building and architecture. Based on the practical experience of a large staff of experts in actual constrcution work (1909)
Johnson, Alfred Sidney, 1860-, Radford, William A., 1865- · Chicago Radford Architectural Co · leaf 157
Fig. 99. Eetainer Valve. of each radiator. An air-pipe connecting to thisvalve is carried to the basement, where it isjoined into a larger air-pipe called an air-main.This line follows closely the direction of thesteam main, terminating at a point near to theboiler, where it drops down and connects… … HEATING AND VENTILATION 131 top of the mercury-seal device. A slightpressure will force the air out of the sealthrough the mercury, which will, however, byreason of its greater density, effectively preventthe return of the air into the air-line, by thisoperation placing the system under a…
Architecture · Building
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