Modify Selection
- Equipment, tools, and parts:
- Communications equipment
- or
- Through-the-earth communications systems
- or
- Medium frequency communications systems
- or
- Leaky feeder communications systems
- or
- Node-based communications systems
- or
- Wireless node communications systems
- or
- Mine phones
- or
- Radios
- or
- Pager phones
Home Links
Results 131 - 131 of 131
-
1/1/1984 - Reports of InvestigationsElectromagnetic narrow-band signals were transmitted through the earth at 27 coal mines located throughout the United States. From those tests, apparent earth conductivity values were derived based upon a homogeneous half-space model of the earth.
Home Links
Content source: National Institute for Occupational Safety and Health, Mining Program