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Proceedings of the Annual Meeting of the Indiana Academy of Science Volume 31

Proceedings of the Annual Meeting of the Indiana Academy of Science Volume 31


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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. 1922 Excerpt: ...transformer was substituted and with a fairly constant source of alternating current gave results which were very much more consistent. Description of Electrical Set-up. A very steady source of alternating current at 110 v. was applied through variabte resistance to a Thordarson transformer of type H-l whose ratio was 1:50. A condenser made of three concentric aluminum tubes, having a capacity of 0.0007 microfared, was placed in parallel with the high voltage terminals. A zinc spark gap with variable adjustment was used in an atmosphere of ether vapor. The Tesla coil was composed of four turns of wire in the primary and 200 in the secondary with an air core. The frequency was measured with a Kolster decremeter calibrated by the Bureau of Standards. The wave length varied according to the size of the wire in the tube and according to whether the measuring apparatus was connected to the tube or to the wire. With No. 29 wire, the wave length was 185 m. for the tube and 2000 m. for the wire, while with No. 16 wire, these values had increased to 260 and 300 m. respectively. The frequency, then, was in the range between 1 and 1.6 million cycles per second. Variations in the width of the spark gap and in the power-input had no effect on the wave length. Attempts to change the frequency by changing the capacity of the primary or secondary circuit of the Tesla coil or by changing the inductance of the secondary had no effect on the frequency but resulted in reducing seriously the secondary current as well as the corona discharge. Evidently an optimum set of dimensions of the circuit can be obtained for each tube according to its capacity. No attempt was made to work out the relationships involved. The electrical circuits used in this work were such as to give optimu...


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Product Details
  • ISBN-13: 9781130526448
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130526445
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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