Proceedings of the Engineers' Society of Western Pennsylvania Volume N . 13

Proceedings of the Engineers' Society of Western Pennsylvania Volume N . 13

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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. 1897 edition. Excerpt: ... will notice the beautiful brush discharges at the terminals of the coil. I have here a large circular ring of wire and a metallic ball, placed in the center of it. I connect one terminal of the coil to the ring and one to the ball, and immediately the intervening space becomes beautifully illuminated with brush discharges. I have here a number of vacuum tubes of varying construction, and of different degrees of exhaustion. These become beautifully illuminated when connected with a wire running from one terminal of the coil. This illustrates the one-wire system of illumination proposed by Mr. Tesla. I was unfortunate in not being able to get one of his lamps, which are specially designed for high frequency coils. These have one leading in wire, and at the end of it a refractory button which becomes very brilliant when the lamp is attached to the coil. I believe it will be impossible to use this system in practice, on account of the great difficulty of insulating the wires and fixtures. You can readily see, from the luminous appearance of the wires and the big sparks one receives upon approaching the hand near them, how unpracticable the system would be in the light of our present knowledge. Up to the present I have shown you how vacuum tubes can be lighted, when connected to one terminal of the high frequency coil. I now propose to show you a most interesting experiment, where tubes of this kind can be brightly illuminated when they are not at all connected with the high frequency coil. I have here a couple of large plates which are placed on insulators. I will connect one of these to one terminal of the high frequency coil, and the other plate to the other terminal. I will now start the coil to work, and you notice that the minute that I more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236638298
  • 9781236638298