Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 303
k was furnished by the compressor plant originally provided for exca- vation of the tunnel plus one 650 cu. ft. compression making a total air capacity of 1,600 cu. ft. per minute. Air was piped down the shaft through a 4 in. line and reduced to 3 in. at the bottom, the three smaller lines shown… … Mixer and Conveyor at Bottom of Shaft. Fiff.
Engineering
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