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Mining and Metallurgy Volume 179

Mining and Metallurgy Volume 179


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...quartz tubes were connected to the recorder, using compensating leads direct to the recording instrument. One of the thermocouples was inserted in the hollow tube close to the eyelet of the socket to be brazed, a mixture of borax and brass filings having been poured down the tube as a brazing flux. It was found that the actual temperature of the furnace and of the couple.were very close. The thermocouple was then removed from the tube and permanently located just to one side of the other burner, so that the hot end was in immediate juxtaposition to the sockets. It was found that a window immediately above the furnace, when open, permitted the air to be drawn into the furnace; an asbestos curtain was installed to prevent this. Two galvanometer systems of several hundred ohms resistance, one for each section of chart, are mounted in gray-iron casting, machined and enameled. As the thermocouples are connected by wire directly to each electrical system, there are no rotating switches to develop poor contact. A continuous roll of carbon ribbon produces a non-smearing dot every 30 sec., which permits the slightest change in temperature to be shown. Thermocouples of base metal or rare metal may be used. The durability of the thermocouples depends greatly on the type of protecting tube selected. In galvanizing tanks, using a high percentage of zinc, a test was made recently of nine types of tubes closed at one end. After two months continuous immersion, all but two of the tubes were entirely eaten through by the action of the zinc; one was of wrought iron with extra heavy wall; the other was a Resisteat tube composed of a high chromium-iron alloy. The wall of the wrought-iron tube was quite thin, but the Resisteat tube showed very little effect. Correspondence and ...


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Product Details
  • ISBN-13: 9781130003895
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130003892
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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