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Electricity for Engineers Volume 1-2; Constant Current

Electricity for Engineers Volume 1-2; Constant Current


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About the Book

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. 1891 Excerpt: ...of current will cause the needles to swing through a greater number of degrees than if a single needle alone was used. Another point about this arrangement is that: although the two needles have their poles acting in opposite directions, you will notice that the effect of the current through the coil will act on both needles to turn them in the same direction. This also gives increased effect. Another way in which the sensitiveness of the galvanometer is increased is by lengthening the pointer. This is done without greatly increasing the weight, by placing a small mirror on the needle, and reflecting a beam of light from it on to a scale placed a couple of feet away. The light is obtained from a lamp placed in a convenient position and partially shaded so that the light is thrown only on the mirror. This is the most sensitive galvanometer known. It is called the Thomson reflecting galvanometer. The" Differential" galvanometer is an interesting instru ment, and its peculiarity is that it has a double coil, that is, there are two coils placed on the same plane and the needle is pivoted between. This would give two separate circuits of the same number of turns and of the same resistance. This is necessary, for the circuits are to be connected in such a way that the current will divide and pass through them in opposite directions--one neutralizing the other's influence on the needle, so that when-the current is passed through the coils the needle will not move. In connection with the differential galvanometer a rheostat or series of coils of known resistance is used. The rheostat is connected in the circuit of one of the galvanometer coils, and the object to be tested is connected into the circuit of the other coil. If the resistance in each coil is t...


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Product Details
  • ISBN-13: 9781150859298
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150859296
  • Publisher Date: 08 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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