Bulletin of the Bureau of Standards Volume 1

Bulletin of the Bureau of Standards 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. 1905 edition. Excerpt: ...be most briefly given here. -Fery: C. R., 134, p. 977; 1902. '-D. Berthelot: C. R., 120, p. 831; 1895. Ann. de Chem. et de Phys., (7) 20, p. 58; 1902. " Provided the envelope does not give off gases or vapors that may influence the results. Light from a source S is divided into two beams by a thick plate Pv One beam is passed through a tube, at constant temperature, in which the pressure may be varied; the other passes through the tube tt, which is heated electrically. The two beams are reunited at the plate 1 and give a series of interference bands in the eye-piece. The manipulation consists in diminishing the pressure in tl as the temperature rises in t2, so as to always keep the fringes stationary. Then from the relation connecting the temperature of a gas with its pressure, density, and index of refraction, proved to hold throughout a considerable range and assumed to hold for higher temperatures, it can be shown that the temperature of the gas in the hot tube is denned in terms of the equivalent lengths of the two tubes and the temperature and pressure of the gas in the cold tube. This method is evidently an independent system of gas thermometry, and while not in the strict sense of the word a method of optical pyrometry, it may eventually be of service in the extension of the gas scale to higher temperatures than can be obtained by the ordinary forms of gas thermometer, and so serve as an independent check on the radiation laws at these high temperatures. 4. Description Of Ins0ruments And Investigation Of Their CaliBration, Range, Sources Of Error, And Precision. Le Chatelier Optical Pyrometer." The introduction of a serviceable and simple optical pyrometer was reserved to Le Chatelier in 1892, after he had perfected...show more

Product details

  • Paperback | 130 pages
  • 189 x 246 x 7mm | 245g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236592549
  • 9781236592545