WONDERFUL LISTENING INSTRUMENT.
The geophc-ne, .u listening inetruPment developed by the French during the war to detect enemy undel‘gl'ound lmining operations, is to be used by the United States Bureau of Mines as a possible aid in locutillg miiners who have ben entombed after a disaster. A miner pounding on a coal seam can be heard with this instrument 1200 feet away. Recently a coal boss who lmppened to be near when xthg geophone was being tested in a mine put. the instrument to his (‘J.I‘S. He heard so distinctly that he eul«led.ollt in an startled tone: “Mack _istalnping in a charge. We had better move; away.” A coal seam 300 feet thick} Sop~:lr:lted Mock from the startled‘ boss at the time. I
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https://paperspast.natlib.govt.nz/newspapers/TAIDT19190828.2.43
Bibliographic details
Taihape Daily Times, 28 August 1919, Page 7
Word Count
123WONDERFUL LISTENING INSTRUMENT. Taihape Daily Times, 28 August 1919, Page 7
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