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Transactions of the Session of the American Institute of Hom Opathy Volume 52

Transactions of the Session of the American Institute of Hom Opathy Volume 52


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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. 1896 Excerpt: ...the electric resistance is changed, the galvanometer is deflected, and the spot of light reflected from the concave mirror, which is hung upon a very fine quartz fibre, is received upon a photographic plate. The galvanometer deflections are shown as in the accompanying figure, which is called a holograph, and from which the line spectrum is constructed. The theory upon which this is based is, that where the infra-red spectrum falls there is development of heat, but where the Frauenhofer lines occur there is no heat, and therefore there is a deflection of the spot of light. With the bolometer it is possible to measure a difference of heat of a hundred-thousandth of a degree of Fahrenheit's scale." It has been for a long time known that rays exist beyond the violet. Indeed, these rays have been utilized in photography, and in this direction the invisible spectrum reaches at least nine or ten times as far as that which can be seen, nor does actinism belong wholly to the violet end, for with heat rays alone objects have been photographed in absolute darkness. It is not my purpose to consider at this time the nature of these rays, but before speaking of their practical utility I wish to refer to another discovery of almost equal importance, and which has a very direct relevancy in this connection. Several years ago Nicola Tesla began a series of experiments with electric currents having an enormously high potential and great frequency of interruption. To obtain such a result special apparatus was required, and this the greatest electrician of modern times obtained in what he termed a disruptive coil. The greatest possible result that could be obtained by the agency of an ordinary Rhumkorff apparatus fell far short of his necessities. He devised, therefore, ...


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Product Details
  • ISBN-13: 9781231172254
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 522
  • Spine Width: 27 mm
  • Width: 189 mm
  • ISBN-10: 1231172258
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 921 gr


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