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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

A Short-range locator system for detecting trapped miners

Published Year

• 1920-1929 (2)
• 1980-1989 (1)

Subject

• Radio--Transmitters and transmission (3) *
• Radio--Receivers and reception (2)
• Telecommunication (2)
• Geophone (1)
• Mine communication systems (1)
• Mine rescue work--Equipment and supplies (1)

Author

• Jakosky, Jay John, (2)
• Zellers, Donald Henry, (2)
• Boyle, James R. (1)
• Church, R. H. (1)
• Pittman, Walter E. (1)
• Webb, William E. (1)

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