A Device for Measuring the Average Temperature of Water, Soil, or Air

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Abstract
It is possible to directly measure average temperature with a simple electronic circuit and avoid the usual time—consuming arithmetic integration of temperature records. Instructions are given for the construction of an electronic integrating thermometer composed of a thermistor in a simple Wheatstone bridge and a mercury coulometer that provides a direct readout of the average temperature of soil, air, or water over a designated time interval.

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