A Century of Electricity

A Century of Electricity

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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. 1887 edition. Excerpt: ...his system into practical use attracted the attention of inventors in Europe and America, and many efforts were made to reduce his idea to practice. Several improvements in his scheme were patented in Europe and in this country, but it was not until 1872 that a really trustworthy system was devised. Mr. Joseph B. Stearns of Boston had been engaged for several years previous to this date in experiments on simultaneous transmission, or, as he called it, duplex telegraphy. In principle his apparatus did not materially differ from that of his predecessor and contemporaries, and until 1872 his success was not more marked than theirs. Early in this year he introduced the "condenser" 1 into what is known as the "artificial" or "compensating " line, thus overcoming the only serious obstacle to success. The great value of his improvement was quickly appreciated, and to Mr. Stearns is generally accorded the credit of having made the system practically possible. The increase in the use of the telegraph within a few years had been such that a generous welcome was extended to any device which enabled one line to do the work of two; and Stearns's system was rapidly adopted, both in this country and in Europe. The fundamental principle is, that a compensation or balance shall be established in such a way, that, when the circuit is closed and a current is sent from one end of the line, the instru 1 A condenser consists of alternate sheets of tinfoil, with some insulating material, such as mica or paraffined paper, and is in principle precisely the same as the Leyden jar. Beginning on one side, the first, third, fifth, seventh, etc., sheets of foil are joined together, and correspond to one coating of the jar: the remaining sheets of...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123663098X
  • 9781236630988