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Some studies on emergency mine communications

Protection against lightning at surface and underground mining plants

The short-circuiting contactor as an electrical protective device for coal-mine service

Some characteristics of the earth as a conductor of electric current

Published Year

• 1940-1949 (2)
• 1950-1959 (2)

Subject

• Earth resistance (1)
• Earth resistance (Geophysics) (1)
• Electric power transmission (1)
• Lightning protection (1)
• Mine communication systems (1)
• Mine safety (1)
• Mine safety--Equipment and supplies (1)
• Radio in mining (1)
• Short circuits (1)

Author

• Harrison, L. H. (4) *
• Coggeshall, E. J. (1)
• Felegy, E. W. (1)
• Harrington, D. (1)
• McCall, M. C. (1)
• Parker, D. J. (1)

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