Electric Traction

Electric Traction

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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. 1905 edition. Excerpt: ... the necessary electro-magnetic action is weak in proportion to the consumption of current spent in creating it. The car carries no electro-magnets, but a small-capacity 500-volt secondary battery is needed on the car to pick up contact when, for whatever reason, this has been slipped. 21. The system invented by Messrs. Claret and Vuilleumier was the earliest in which all movable parts were removed from the immediate neighbourhood of the studs and the running track, and in which the switches were brought together in groups. A group of twenty contacts are set in a circle upon a horizontal circular entablature, in the centre of which is fixed a vertical pin. In outline this construction is shown in Fig. 110, in which T indicates the contact blocks, and the diagram Fig. Ill helps the explanation of its action. The apparatus is called a "distributor" or "distributing switch." Each contact, T, on the distributor is connected by a single lead to a pair of studs in the road. The collecting skate is long enough to touch two studs at one time, but not long enough to touch three studs simultaneously. A boss, mounted on the pin of the distributor, carries three arms, A, B, C, on the end of each of which is a contact brush or block. The middle brush A is wide, so that it can touch two fixed contacts T at once, bridging over the insulating gap between them. This middle brush is connected to the supply main. The two outer brushes, B and C, are narrow, so that they do not bridge over this gap. They do not connect to the supply except through the car-skate. B and C lead shunt-currents from the track-studs to earth through the high-resistance coils of two electro-magnets, b and c, in the distributor, whenever either is connected to a...show more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236819950
  • 9781236819956