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

A Short-range locator system for detecting trapped miners

Published Year

• 1920-1929 (1)
• 1980-1989 (1)

Subject

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

Author

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

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