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Scientific American, Vol. 88, No. 18 (1903) (1903)
leaf 4
are two stations, the transmitting and the When directly over the lode, the noise in the resona- promising to encourage the mine proprietors to con- tors will be loudest. receiving. At the former there is a battery of 12 volts, tinue their working. In °1899 the inventors commenced experimenting… … cess in prospecting for Other it was placed some © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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