Results 1 - 9 of 9

• Development of a Through-the-Earth Monitor System
  12/1/1980 - Contract reports, Open File Reports
  The objective of this program was to design and build a self-contained system for remote monitoring of the atmosphere in mines. The system developed uses the mine pager phone line as the primary communication channel and also has the capability of using...
• Development of a Visual Display and Control System
  10/1/1980 - Contract reports
  The object of this program was to extend the capabilities of visual paging systems both in size and functions in mines. The system developed uses the mine pager phone line for communication, monitoring, and remote control. The system was designed to be ...
• Development of a Call Alert System for Paging Mine Personnel
  1/1/1978 - Contract reports
  This report presents system objectives and design criteria for an in-mine ultralow frequency radio paging system.
• Underground Mine Communications (in Four Parts): 2. Paging Systems
  1/1/1977 - Information Circulars
  This Bureau of Mines report summarizes the research, development, and evaluation demonstrations conducted by the Bureau of Mines under the Coal Mine Health and Safety Act of 1969 to improve the means of notifying miners underground, who are away from th...
• U.S. Bureau of Mines New Developments in Mine Communications
  8/1/1976 - Conference papers
  A brief description is given of various Bureau of Mines research activities that have begun since July 1974 and are not being reported on by others at the Third West Virginia University (WW) Conference on Coal Mine Electrotechnology.
• Experience with an Integrated, Computer-Controlled Communications and Monitoring System at the Robena Mine
  8/1/1976 - Conference papers
  A whole mine, computer-controlled communication and monitoring system for both normal and emergency use is installed and operating in the U.S. Steel Robena Mine complex near Uniontown, Pa. Experience with the system is reviewed.
• Technical Bulletin Pager Phones: Installation
  4/1/1975 - Contract reports
  The pager phones used in many underground coal mines are battery-operated, party-line telephones with provisions for loudspeaker paging. The system is two-wire, non-polarized, and is operated by self-contained batteries. A description of the many teleph...
• Technical Bulletin Pager Phones: Circuit Protection
  1/1/1975 - Contract reports
  Wires leading to or from underground facilities can develop hazardous voltages because of lightning exposure. The locations of many mine portals are particularly susceptible to lightning effects. The application of protective devices to limit this poten...
• Analysis of Communication Systems in Coal Mines
  5/1/1973 - Contract reports
  The results of a two-year research effort aimed at improving communication systems in coal mines is reported, as well as a review of communication methods presently used in coal mines. Theoretical and-experimental results of a four pronged effort in the...