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Factors retarding transmission of radio signals underground, and some further experiments and conclusions

Line radio and the effects of metallic conductors on underground communication

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

Maintaining the permissibility of electric cap lamps

Published Year

• 1920-1929 (2)
• 1930-1939 (2)

Subject

• Electricity in mining (2)
• Radio--Receivers and reception (2)
• Radio--Transmitters and transmission (2)
• Telecommunication (2)
• Blasting (1)
• Electric lamps (1)
• Geophone (1)

Author

• Zellers, Donald Henry, (4) *
• Hooker, A. B. (2) *
• Jakosky, Jay John, (2)
• Ilsley, L. C. (1)

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