Using available, or easily borrowed, equipment we have constructed an ac system for measuring thermopower. With this system we have measured the thermopower of a gold-aluminum thermocouple from 30 to 150°C with accuracy of a few percent, using a temperature difference of 0.03 K. With care, and the proper equipment, measurements accurate to about 1% appear possible, using a temperature difference smaller than 0.01 K.
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Freeman et al. (1970) studied this question.
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