Thomas Edison Thomas Edison National Historical Park …

gold ore separation. Ob-serves transfer of electrons between electrodes within a glass globe—the "Edison Effect"—which eventually leads to development of vacuum tubes used in radio and television. 1887–88 Opens new lab complex in West Orange. Experiments with ore separation, shift-ing focus from gold to iron ore. Spurred by rivals' in-

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Thomas Edison – Geophysicist and Prospector

The Ogdensburg Iron Ore Venture. Edison was no stranger to prospecting and mining. In the 1890's he had launched a New Jersey-based iron ore milling and processing plant using ore from a low-grade magnetite deposit near Ogdensburg, NJ, in an ill-advised attempt to corner the US iron-ore market.

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Edison Ore-Milling Syndicate, Ltd.

The company used Edison's patents and ore milling designs when developing iron deposits in the Dunderland River valley, near Mo, Norway. It also tried to promote the use of Edison's ore milling technologies in diamond crushing, gold separation, and cement manufacturing.

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