The Blue Print Volume 2

The Blue Print Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...between two parallel rows of carbon, vertically over each other. Siemens was probably the first to reduce the furnace to a practical form, about 1879. In the Siemens furnace the electrodes passed through holes in the sides of the crucible, both electrodes and crucibles being of carbon. The Cowles Brothers used a furnace in the early 80's for the reduction of metallic oxides. The apparatus consisted of a carbon cylinder closed at one end by a carbon plate which formed one electrode, and at the other end by a graphite crucible which formed the other electrode. A mixture of the ore and coke was heated by the passage of the current. Early in the use of the electric furnace and especially when used in the production of carbides, it became evident that the arc between electrodes confined itself almost entirely to the path offered by the first carbide formed, this material being a much better conductor of the electric current than the carbon and the lime charge at first attacked. Much energy was lost by the tendency of the current to follow the new low resistance path. A great many mechanical devices were used to try to get over this trouble by causing the arc to move around so as to be brought into contact with the new material. About 1888 it was first proposed to use the magnet to direct the arc, and it seems strange that after this had once been thought of and found successful. that so many other very clumsy devices should have been tried in an attempt to bring about the same result. A strong permanent magnet may be used for this purpose, or an electro-magnet, the latter of course being stronger and much more easily adjusted to suit the conditions. Mr. Patton suggests the following: "Suppose we are using a direct current for the...show more

Product details

  • Paperback
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236805291
  • 9781236805294