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General Theory and Practice Volume 1

General Theory and Practice Volume 1


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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. 1919 Excerpt: ...implies that there is one spark for each half cycle of generator voltage, so that the sparking rate equals twice the generator frequency. The rotary disc will have as many studs as there are poles on the generator and will be driven at the same speed as the armature, preferably mounted on the same shaft for small power transmitters. It will be found that the edges of both the movable and fixed electrodes will wear away on the sides of them which approach each other; this will slightly upset the proper tuning of the spark unless the fixed electrodes are Fio. 109. shifted a little forward or the faces of the electrodes filed down and the length of the gap readjusted to its proper value. Now if there are more studs on the rotary disc than poles on the generator a discharge can be obtained before the half cycle is complete; the condenser will charge up again during the completion of the cycle and a second discharge may be obtained during the half cycle. In this case the condenser will never charge up to the maximum voltage, therefore the oscillating energy at each discharge will be less than before; also the spark gap will have to be shorter, and the condenser voltage may not necessarily be the same for the two discharges in the half cycle. We have now less energy at each discharge but more discharges per second, therefore the ultimate oscillating energy per second may be the same as with synchronous sparking and there is the advantage of a, ., .. m... r.p.m. X No. of studs higher spark note. The sparking rate is now----where r.p.m. is the speed of the rotary disc. As there is not necessarily the same amount of energy in each discharge some of the movable studs may regularly get the heavier sparks and wear away faster than the others. This is obviated in practice.


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Product Details
  • ISBN-13: 9781130884456
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 144
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1130884457
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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