Electricity and Its Uses

Electricity and Its Uses

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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. 1883 edition. Excerpt: ...number of correspondents by the "exchange" system. The telephone exchange is a web of telephone circuits all radiating from one central station to separate houses in a district or town, so that any person renting the use of a circuit can speak to any other client of the exchange by asking the attendant at the central station to connect his circuit to that of the client in question. Thus, if Brown, of Mark Lane, E.c, wishes to speak with his friend Eobinson, of Cheapside, he simply goes to the telephone hanging up in his office and calling up the attendant at the central station of the United Telephone Company in Coleman Street, requests to be put in communication with Eobinson. The clerk replies, "All right;" then, by means of a " switch" board, to which all the ends of the circuits radiating from the station are brought, he quickly joins the circuits of Brown and Eobinson, and leaves them to talk together until they signify that they have done. In this way much time is saved in keeping personal appointments; and business is greatly facilitated. One curious result of the exchange system is that outlying property has risen in value, owing to the annihilation of distance in business transactions. Several ingenious apparatus have been invented for promptly working the exchanges; but as they are mere accessories to the telephone we shall not describe them here. We ought to mention, however, the automatic exchange of Mr. Connolly, and that of Messrs. Brown and Saunders, by which a small group of subscribers can communicate with each other without the assistance or intervention of a central office. This improvement not only saves time but is more confidential in its operation than the public exchange, and will no...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236977068
  • 9781236977069