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Application of the geophone to mining operations

Use of geophone in locating compressed-air leaks

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

Published Year

• 1920-1929 (3) *

Subject

• Geophone (3) *
• Compressed air (1)
• Compressed air--Safety measures (1)
• Mine ventilation (1)
• Mines and mineral resources--Equipment and supplies (1)
• Mines and mineral resources--Equipment and supplies--Maintenance and repair (1)
• Radio--Receivers and reception (1)
• Radio--Transmitters and transmission (1)
• Telecommunication (1)

Author

• Jakosky, Jay John, (1)
• Leighton, Alan, (1)
• Pickard, Byron O., (1)
• Zellers, Donald Henry, (1)

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