Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 241
1871. G. H. B. _ LAMPS, SAFETY. The explosive mixture of light carburetted hydrogen and atmospheric airwhich is often present in coal-mines long made it desirable to procure some kind of device by whichthe ignition of the compound might be avoided. Contrivances called steel mills were first used… … LAMPS, SAFETY. 231 2572. 2573. air these however were not safe, as the sparks were liable to produce explosion. Their greatly in-creased brilliancy in this served to indicate danger; and where the gas predominated above the ex-plosive proportion, the sparks were of blood-red color or ceased…
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