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The relative safety of brass, copper, and steel gauzes in miners' flame safety-lamps

Permissible single-shot blasting units

How leakage of current from an electric shot-firing circuit causes misfires

Published Year

• 1920-1929 (2)
• 1930-1939 (1)

Subject

• Blasting (2)
• Electricity in mining (1)
• Mine explosions--Prevention (1)
• Safety lamps--Materials--Testing (1)

Author

• Hooker, A. B. (3) *
• Ilsley, L. C. (3)
• Zellers, Donald Henry, (1)

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