THE Safety in Mines Research Board has issued as Paper No. 86 an account of an automatic firedamp recorder, reference to which has already been made and a picture of the plant published in the twelfth ...
Foreign Correspondence THE NEW YORK TIMES. TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s ...
THE suspended impurity in the air can be measured by two methods, the automatic recorder or filter, and the jet dust counter method. The former was designed primarily for measurement of smoke ...
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