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!!!!1881 __ Electric ore finder * ''Comment :'' « In a letter received by a Thames resident from a prominent mining man in Westralia reference was made to the new electric ore finder. We quote the following : “About the electrical ore finder - A current of electricity passing through a coil is made to enter the ground at one point in the property, and passes through the earth to another point where a telephone receiver allows observer to estimate the different intensity of sound made by the make and break in the circuit. The sound becomes louder under certain conditions of reef and mineral contents underground, but it is almost impossible to say whether the change in any particular instance is due to a fairly high percentage of iron pyrites or a small amount of gold, which gives practically the same result with the finder.” » ''(In ‘Thames Star’, Volume XXXXI, Issue 10687, 16 August 1904, p. 1)'' * ''Attached references :'' {small}R. W. Fox (?), ''Metal detector'' (ca 1830) ; Joseph Henry (1797-1878) & Michael Faraday (1791-1867), ''theory of electromagnetism'' (1831) ; Heinrich Wilhem Dove (1803-1879), ''earliest form of induction balance'' (1841) ; Alexander Graham Bell (1847-1922), ''experiments in induction balance with the telephone'' (1877) ; Prof. David E. Hughes (1831-1900) & William Groves (?), ''Induction Balance (I.B.) as a metal locator'' (1879) ; George Hopkins (?), ''Hopkins electric ore finder'' (1881) ; Dr. John Girner (?), ''experimentation with locating metallic masses in the human body'' (1887) ; Captain McEvoy (?), ''electric submarine detector'' (1883 & ca 1905) ; London Electric Ore Finding Company Ltd, ''Bristish patent of a metal detector'' (1902) ; Electric Metal Locating Company of Chicago (and Fred H. Brown (?), ''metal detection'' (?) ; Daniel Chilson (?), ''electromagnetic radio-detector'' (1924) ; George Williams (?), ''Radio-Locator'' (ca 1925) ; Gerhard Fisher (?), ''Metalloscope'' (1929) ; Theodore Theodorsen (1897-1978), ''instrument for detecting metallic bodies buried in the earth : N.A.C.A Bomb Detector'' (1930) ; George Maher (?), ''Alpha'' (?) ; Engineering Research Corporation, ''Terrasearch'' (?) ; Goldak Inc., ''Radioscope'' (ca. 1939) ; J. Evan-Hart & D. Stuckey (?), ''Detectorist'' (2007).{/small} {br}{br}
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