The Theory of Sound Volume 2

The Theory of Sound Volume 2

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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. 1896 edition. Excerpt: ...theory of the velocity of sound. When the transfer of heat takes place at the moment of greatest condensation or of greatest rarefaction, the pitch is not affected. If the air be at its normal density at the moment when the transfer of heat takes place, the vibration is neither encouraged nor discouraged, but the pitch is altered. Thus the pitch is raised if heat be communicated to the air a quarter period before the phase of greatest condensation; and the pitch is lowered if the heat be communicated a quarter period after the phase of greatest condensation. In general both kinds of effects are produced by a periodic transfer of heat. The pitch is altered, and the vibrations are either encouraged or discouraged. But there is no effect of the second kind if the air concerned be at a loop, i.e. a place where the density does not vary, nor if the communication of heat be the same at any stage of rarefaction as at the corresponding stage of condensation V Thus in any problem which may present itself of the maintenance of a vibration by heat, the principal question to be considered is the phase of the communication of heat relatively to that of the vibration. 322 h. The sounds emitted by a jet of hydrogen burning in a pipe open at both ends, were noticed soon after the discovery of the gas, and have been the subject of several elaborate inquiries. The fact that the notes are substantially the same as those which may be elicited in other waj's, e.g. by blowing, was announced by Chladni. Faraday" proved that other gases were competent to take the place of hydrogen, though not without disadvantage. But it is to Sondhauss that we owe the most detailed examination of the circumstances under which the sound is produced. His experiments prove the...show more

Product details

  • Paperback | 146 pages
  • 189 x 246 x 8mm | 272g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236648439
  • 9781236648433