The Measurement of High Temperatures

Cover The Measurement of High Temperatures
The Measurement of High Temperatures
George Kimball Burgess
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Fixed Points. As the scale determined by the gas thermom- eter is the one universally recognized, it is necessary, in order to calibrate a pyrometer, to express its indications in terms of the gas scale. In general, it is not feasible to compare the readings of a pyrometer directly with those of the gas thermometer. The use of the latter becomes restricted mainly to the establishment of certain constant, reproducible temperatures or fixed points such as are given by freezing points and boiling
...points of the chemical elements and of certain compounds. The accuracy at- tainable in pyrometric researches is, therefore, limited by the exactness of our knowledge of these reference temperatures, and their determination has been and still is of the most fundamental importance in pyrometry. There have been a great many tem- jratures suggested for this use, but the actual number available is very small. Preference should, in general, be given to those deter- minations made with the gas thermometer itself, although there are others made indirectly in terms of the gas scale, as with thermocouples, optical pyrometers, and resistance thermometers, which are of considerable weight; and in fact the more common practice, when working with the gas thermometer, is to compare its readings in a furnace or bath with those of some more con- venient instrument and then transfer the gas scale by means of the latter to the melting or boiling points by interpolation.

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