Abstract
I AM quite in agreement with Prof. Sydney Young (NATURE, December 19, p. 152), that after the lapse of a sufficient time—let us say, an infinite time—the constant slow rise of the zero-point of a thermometer at the ordinary temperature will attain a definite limit; but I cannot accept his view that the effect of heating the thermometer to a high temperature is simply to increase the rate at which this final state is approached. If the results of experiment at the ordinary temperature be expressed in a mathematical formula which admits of making the time infinite, the limiting value of the rise (on that condition) will not exceed on the average 2°C., even in a thermometer of lead glass. After exposure to a high temperature, and in the same thermometer, so great an ascent as 18°C. is a possible measurement, actually realized. The two phenomena are therefore very different in their nature.
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MILLS, E. Exact Thermometry. Nature 41, 227 (1890). https://doi.org/10.1038/041227a0
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DOI: https://doi.org/10.1038/041227a0
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