Electricity and the Electric Telegraph Volume 1

Electricity and the Electric Telegraph Volume 1

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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. 1892 edition. Excerpt: ...or other influences. They have not as yet been used to any considerable extent in the United States. In some portions of the United States, as well as in Switzerland and in the island of Java, living trees have been made available over large tracts of country as supports for telegraph wires. The brackets for the insulators are attached to the trunks of the trees, and the branches so far cut away that, even in a heavy gale, there will be no danger of their coming in contact with the wires. A line may be very quickly and cheaply constructed in this manner, and has in many cases been found to answer very well as a permanent line, especiallv when trees of a suitable character are planted along the route at convenient intervals, as has been done in Austria and in Java. When put up in this manner, however, the wire is very easily broken by the repeated bending which is caused by the swaying of the trees during heavy winds, and it has, therefore, been found necessary to use a specially arranged insulator to avoid this difficulty. Fig. 154 represents an arrangement devised by Lieut.-Col. Cb.auvin, formerly Eoyal Prussian Director of Telegraphs, which allows the tree to move freely without interfering with the wire. Fig. 154. The upper end of a permanent iron carrier is screwed into the tree, the lower end being fastened by a strong wood-screw. The insulator is suspended from the eye of the carrier by an iron rod, and the wire hook is cemented into the bell of the insulator, and bent outwards so that it cannot be turned over. Experience has shown that this device answers its purpose admirably. The method of attaching wires to trees which is employed in America is much simpler than the above, but has been found to serve well. It will be described...show more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236568486
  • 9781236568489