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Comparison of some platinum thermometers with the helium thermometer between 0 and −183°C

1935; Elsevier BV; Volume: 2; Issue: 1-12 Linguagem: Inglês

10.1016/s0031-8914(35)90196-3

1873-1767

W.H. Keesom, B.G. Dammers,

Spacecraft and Cryogenic Technologies

Five platinum thermometers, satisfying the conditions stipulated in the definition of the international temperature scale are compared with the helium thermometer between 0 and −183°C. A cryostat is described giving a temperature constant and uniform within 0.002 degree. The readings of three of the thermometers (two of wire from Heraeus, one of wire obtained from the Bureau of Standards) agree within 0.003 degree. The fourth thermometer, made from wire furnished by Johnson and Matthey,and not compared directly with the others, agrees with those mentioned within reading errors of the helium thermometer. The fifth thermometer, from Heraeus wire, gives readings which differ 0.03 degree at −138°C from those of the first-mentioned set. The international temperature scale lies for temperatures between 0 and −100°C below the thermodynamic scale, to an amount of about 0.04 degree at −80°C. Between −120 and −183°C the international temperature scale lies above the thermodynamic scale. Maximum deviation between −130 and −140°C. Amount of the deviation as shown by the four first mentioned thermometers 0.01 to 0.02 degree.