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Two devices to prevent electric arcs with airdox operations in coal mines
A study of stray electric currents in airdox systems in coal mines
Minimizing fire hazards in coal mines by proper circuit-breaker protection of 250/275-volt direct-current systems
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Published Year
1940-1949 (2)
1950-1959 (1)
Subject
Coal mines and mining--Safety measures (3)
Coal mines and mining--Electric equipment (2)
Coal mines and mining--Equipment and supplies (2)
Compressed air (2)
Electric circuit-breakers (1)
Electric circuits--Direct current--Safety measures (1)
Mine fires--Prevention and control (1)
Author
Gallagher, F. J. (3) *
Brown, C. L. (1)
Hyvarinen, John. (1)
