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

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

Maintaining the permissibility of electric cap lamps

Published Year

• 1920-1929 (1)
• 1930-1939 (2)

Subject

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

Author

• Zellers, Donald Henry, (3) *
• Hooker, A. B. (2)
• Ilsley, L. C. (1) *
• Jakosky, Jay John, (1)

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