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Home > Art, Film & Photography > Electrical Engineer Volume 10; An Illustrated Record and Review of Electrical Progress
Electrical Engineer Volume 10; An Illustrated Record and Review of Electrical Progress

Electrical Engineer Volume 10; An Illustrated Record and Review of Electrical Progress


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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. 1892 Excerpt: ...a carbon preservative, and continuing the process of forcing a fresh carbon preservative atmosphere into the globe till the filament was freed from all gas. It was in 1879--or a year after Sawyer--that Edison took out a patent for a somewhat similar process to the above. He heated the filament in a globe from which the air had been exhausted, and continued the process of exhaustion till the filament was freed from all gas. In 1879, also, Edison took out a patent for a mould for carbonising a whole material; while in 1880 Swan has two patents--one for baking filaments in powdered charcoal or carbon, the other for the parchmentising of material for filaments. We cannot see where this parchmentising process differs from that of Gaine thirty years before--a process fully described in various publications, and applied to paper and vegetable fibres. The application of parchmentised material to the use of incandescent lamp making was Swan's, and we think all the credit of this is due to Mr. Swan. Edison, as is well known, was indefatigable in trying everything he could lay his hands on, and ultimately preferred bamboo. However, we are entering more into history than we at first intended. Sawyer's, or Cheesbrough's, "flashing" patent is numbered 4,847 of 1878--hence the patent lapses this year, and, as above stated, in November. Many people fancy that they have discovered some kind of filament outside the patents of Edison-Swan, and that with the end of the Sawyer patent process they will be able to start manufacture. In our opinion, there can be no real competition with the Edison-Swan combination till the lapse of patent No. 250 of 1880--that is, till the beginning of the year 1894--say, about eighteen months from this date. CORRESPONDENCE. 11 One man's...


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Product Details
  • ISBN-13: 9781236362193
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 788
  • Spine Width: 40 mm
  • Width: 189 mm
  • ISBN-10: 1236362195
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 1379 gr


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