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Permissible electric lamps for miners

Why miners' portable electric lamps require safety devices

Field performance of permissible electric cap lamps

Published Year

• 1910-1919 (1)
• 1920-1929 (1)
• 1940-1949 (1)

Subject

• Electric lamps, Portable (3) *
• Safety lamps (2)
• Mines and mineral resources--Equipment and supplies (1)
• Mines and mineral resources--Research (1)

Author

• Clark, H. H. (1)
• Hooker, A. B.. (1)
• Ilsley, L. C. (1)

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