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AIDS to Electro-Therapeutics

AIDS to Electro-Therapeutics


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About the Book

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. 1920 edition. Excerpt: ... I-inch or 2-inch spark-gap, so that the added resistance they impose in the circuit is not great. The valve tube has two metal electrodes, the terminals of which pass through the walls of the tube, where they are sealed off. One electrode is generally in the form of a point, or a small round plate, while the other is of large size, and generally forms a spiral of thick wire. It is found that the current readily passes through the tube when the spiral 'is connected to the negative pole of the coil and the point to the positive, but that great resistance is imposed to the passage of current if these connections are reversed. Hence, if one or more of these valves be inserted in the circuit with proper regard to polarity, the heavy break current will pass through with little difficulty, while the much smaller "make " current (or inverse current) will be suppressed. The valves are connected in series if one is found inadequate to suppress the inverse current, and may be connected to either pole of the coil, or to both, as may be found more satisfactory. According to the commonly accepted theory of the passage of current through a vacuum tube, the action of the valves is as follows: When the large spiral electrode forms the cathode, an extensive surface is afforded for the generation of electrons (or negatively charged particles), and a sufficient number of these will reach the anode to carry the current readily through the tube. When the small point or plate forms the cathode at the "make " impulse, a very small surface is offered for the emission of electrons, and the passage of the current is correspondingly obstructed. Sir Oliver Lodge, however, thinks that the electrons (which, of course, constitute the...


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Product Details
  • ISBN-13: 9781230072616
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1230072616
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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