Bulletin of the American Institute of Mining and Metallurgical Engineers

Bulletin of the American Institute of Mining and Metallurgical Engineers

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ...the Bureau of Standards, for reasons given above, is using 444.6. A change of 0.1 in the temperature chosen for the sulfur boiling point corresponds to a change of about 0.4 per cent. in 6, which would affect the temperature scale by less than 0.002 at 50 C. It is worthy of note that the several national laboratories have, in effect, abandoned the international hydrogen scale either as an ultimate standard or as a working standard. It is, therefore, a matter of great interest to determine whether, in actual practice, the scale used by these laboratories differs measurably from the hydrogen scale of the International Bureau. The results of numerous unpublished intercomparisons of the scale defined by platinum resistance thermometers and the hydrogen scale, derived from the mean of a large number of verre dur thermometers, 1' show that the scale defined by the platinum resistance 7 Ann._d. Physik 4 (1912) 39, 1230. ' Jnl. Am. Chem. Soc. (1919) 41, 745. Am. Jnl. Sci. (1912) 33, 530; Ann. d. Physik (1912) 38, 865. 1 Proc. Royal Soc. London (1914) A. 90, 189. " See Ezer Griffiths: "Methods of Measuring Temperature," 8. Charles Griffin & Co., 1918. 1' Waidner and Dickinson: Op. cit. thermometer is in agreement with the hydrogen scale of the International Bureau to well within the limits of accuracy with which the latter scale has been distributed to the scientific world by means of standardized primary standard verre dur thermometers. The advantage of using the platinum resistance thermometer to define the standard scale lies in the fact that platinum of _the required purity is readily available, that its purity is easily verified, and that the standard scale in the interval 0 to 100 can be reproduced in any...
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Product details

  • Paperback | 896 pages
  • 189 x 246 x 45mm | 1,565g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236753119
  • 9781236753113