Last week while mine inspectors were investigating the coal mine tragedy in Millfield, Ohio (see p. 18), Daniel Harrington, Chief of the Safety Division of the U. S. Bureau of Mines, urged metal mine operators to adopt a modern method of warning miners of danger. The alarm signal is a penetrating odor. Metal mines (unlike coal mines, which use electrically operated fans) are ventilated by compressed air which travels into the farthest corners at the rate of about 1,000 ft. per sec. Engineers have found that a...
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