“I develop a method for the direct and expeditious comparison of the thermo-couple with the air thermometer. A comparison of the data… gives me a criterion of the accuracy with which the data in the region of high temperature are known. This indirect method… is not apparently as rigorous as their direct evaluation by means of the air thermometer; but the indirect method requires much smaller quantities of substance and may be conveniently extended to much higher temperatures. Taking all liabilities to error into consideration, its inferior accuracy is only apparent.”

—  Carl Barus

"On the Thermo-Electric Measurement of High Temperatures" (April 8, 1889)

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Carl Barus 15
U.S. physicist 1856–1935

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