Bulletin, Utgave 347

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U.S. Government Printing Office, 1931

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Side 5 - ... are a result of the action of atmospheric air and mine water upon the sulphides and carbonates in the fissured rock.
Side 9 - Some of the heaviest losses of life in metal-mine fires have resulted from the burning of less than a railroad freight car or only a few cords of timber.
Side 6 - Some of the smaller mines particularly troubled by gases have for years used a...
Side 18 - ... by emptying a bottle filled with water in the air to be tested and then tightly sealing the bottle.

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