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Excerpt from The Ventilation of TunnelsSources OF foul air The sources of foul air are various. During construction noxious gases arise from.the lamps and torches used to light the interior of the tunnels where electric plants are not used for lighting. The respirations of men and beasts also cause objectionable odors. However, the principle source of noxious gases is blasting, and the fumes that arise from.the exp plosives are so dense that t...

Excerpt from The Ventilation of TunnelsSources OF foul air The sources of foul air are various. During construction noxious gases arise from.the lamps and torches used to light the interior of the tunnels where electric plants are not used for lighting. The respirations of men and beasts also cause objectionable odors. However, the principle source of noxious gases is blasting, and the fumes that arise from.the exp plosives are so dense that t...