Scientific American Supplement, No. 384, May 12, 1883

Scientific American Supplement, No. 384, May 12, 1883

By (author) 

List price: US$15.83

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks


Excerpt: ...had been found necessary were one renewal of the commutators and an occasional change of metallic contact brushes. An interesting application of electric transmission to cranes, by Dr. Hopkinson, was shown in operation. Among the numerous other applications of the electrical transmission of power, that to electrical railways, first exhibited by Dr. Werner Siemens, at the Berlin Exhibition of 1879, had created more than ordinary public attention. In it the current produced by the dynamo machine, fixed at a convenient station and driven by a steam engine or other motor, was conveyed to a dynamo placed upon the moving car, through a central rail supported upon insulating blocks of wood, the two working rails serving to convey the return current. The line was 900 yards long, of 2 ft gauge, and the moving car served its purpose of carrying twenty visitors through the exhibition each trip. The success of this experiment soon led to the laying of the Lichterfelde line, in which both rails were placed upon insulating sleepers, so that the one served for the conveyance of the current from the power station to the moving car, and the other for completing the return circuit. This line had a gauge of 3 ft. 3 in., was 2,500 yards in length, and was worked by two dynamo machines, developing an aggregate current of 9,000 watts, equal to 12 horse power. It had now been in constant operation since May 16, 1881, and had never failed in accomplishing its daily traffic. A line half a kilometer in length, but of 4 ft. 81/2 in. gauge was established by the lecturer at Paris in connection with the Electric Exhibition of 1881. In this case, two suspended conductors in the form of hollow tubes with a longitudinal slit were adopted, the contact being made by metallic bolts drawn through these slit tubes, and connected with the dynamo machine on the moving car by copper ropes passing through the roof. On this line 95,000 passengers were conveyed within the short period more

Product details

  • Paperback
  • 189 x 246 x 2mm | 86g
  • United States
  • English
  • black & white illustrations
  • 1236692136
  • 9781236692139