LISTENING FOR METALS
Old legends tell of men mho had the power to look down into the e-rrth and see wlioro gold and silver lay hidden. We cannot- do this yet, but something almost as wonderful is now possible; we can listen and hoar the veins of precious metal. Two Swedish engineers, Mr Hans Lundberg aud Mr Harry Natharst claim to have invented an electrical instrument which will locate metallic ores under the ground and indicate their presence by making a sound that can he hoard. The prospector carries tho instrument over the ground lie is urogpoot-iiig, and, with telephone receivers fixed on his head, lie listens in. When the instrument passes over a vein a sound is heard, and the prospector knows that wliat lie seeks is somewhere beneath his feet.
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Bibliographic details
New Zealand Times, Volume LI, Issue 11855, 14 June 1924, Page 13
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132LISTENING FOR METALS New Zealand Times, Volume LI, Issue 11855, 14 June 1924, Page 13
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