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Home > Art, Film & Photography > 1884-87, the Electrician and Electrical Engineer Volume 6; A Monthly Review of Theoretical and Applied Science
1884-87, the Electrician and Electrical Engineer Volume 6; A Monthly Review of Theoretical and Applied Science

1884-87, the Electrician and Electrical Engineer Volume 6; A Monthly Review of Theoretical and Applied Science


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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. 1887 Excerpt: ...when the heating is the same. In other words, if one coil is twice as large in all linear dimensions as another, and has wire of twice the diameter, the square of the current in the larger one may be made 2' = 8 times as great as the square of the current in the smaller; that is, the current in the larger may be 4/8 = 2.8 times that in the smaller, in order that both attain the same temperature. In the same article he gives a formula which he states agrees with what is actually found in practice. From this the following practical rules may be deduced: A watt of electrical energy will be dissipated for every 800 square centimeters of external surface of the coil, when the temperature of the coil is 1 centigrade higher than that of the air; reducing this to our ordinary units, it is 223 square inches for 1 Fahrenheit. The number of watts which can be dissipated from a given surface of coil increases directly with the temperature which the coil may have above that of the atmosphere; that is, for double the increase in temperature the watts in the coil may be twice as great; or for the same allowable temperature, it increases directly as the surface of the coil is increased. The same rules may also be stated as follows: The rise of temperature above that of the atmosphere will be 1 centigrade for every watt and every 800 square centimeters of surface; or 1 Fahrenheit for every watt and every 223 square inches of surface. For the same surface it increases as the number of watts, or for the same watts it increases as the surface decreases. Every square centimeter will dissipate a watt at 800 C. above the atmoshere, and every square inch will dissipate a watt at 223 F. above the atmosphere. The surface must increase with the watts or decrease as the allowable temp...


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Product Details
  • ISBN-13: 9781231354155
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 670
  • Spine Width: 34 mm
  • Width: 189 mm
  • ISBN-10: 1231354151
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 1175 gr


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1884-87, the Electrician and Electrical Engineer Volume 6; A Monthly Review of Theoretical and Applied Science
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