976 resultados para Indiana. Bureau of Mines and Mining


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Includes: Biennial report of Factory, Mill and Railroad Inspection, and: Biennial report of the State Inspector of Coal Mines.

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Mode of access: Internet.

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Mode of access: Internet.

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Part V of the report of the Department of Internal Affairs

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The laboratory model is considered in this thesis. Information gained from this investigation has not been trans­ferred to the larger industrial machines. Some of the factors noted concerning the efficiency of the laboratory shaking table are inherent in this small scale model only.

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The smelting of complex lead ores is a difficult operation, especially when they contain considerable amounts of iron and zinc. When these ores are smelted, all of the zinc, which is valuable and well worth recovering, goes into the slag. With the advent of the flotation processes, and the ability of these processes to concentrate the lead and zinc minerals into separate products, the smelting of complex lead ores was to a great extent simplified.

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"Appointed to inquire into the causes of the present dearness and scarcity of coal."

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On verso of t.-p.: First edition. June, 1913.

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Compiled by E.H. Burroughs, 1915-