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Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 213
417 A WELL VENTILATED MINE. latedby only one main current almost stops the flow; to overcome this, -whenever possible, the entries or headings should be driven larger than is simply required for the roadway. When the current is in several splits this blocking of the air by trips of cars is not so… … END ELEVATION 20 FT. FAN - N.9.© MINE ■ -J> CO ; .Y>/~o oiVe Jlytfr- Engineer. The value of compressed air as a ventilator is made much of by those interested in introducing mining machinery to be driven by compressed air, but when we consider that it is a very large sized compressor that…Engineering
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