A French inventor lins contrived an application of tho microphone t<i t.hc discovery of underground wat«r. One rnd of n tubo is inserted in tho pround, tho upper end Immnp attached to tho microphone. The Bounds of flowing or dropping water nro conveyed to the car from f,'reat depth*. In tho Mnrno Ynllev two springs wero discovered with this apparatus at a depth of nbout 50ft Mow the surface of tho ground. It is believed that the .lpparatun will bo of croat service in mininc operations both for indicating tho looition of concealed Bprinqs and for communicating with imprisoned miners.
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Bibliographic details
Otago Daily Times, Issue 15301, 15 November 1911, Page 5
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100Untitled Otago Daily Times, Issue 15301, 15 November 1911, Page 5
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