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The thermistor hygrometer described by Penman and Long has been tested against a standard Assman psychrometer, under tropical conditions. It is shown that the instrument is not reliable unless used in the shade. Several modifications are described, and proposals are put forward for improving the performance in high light intensities. Penman and Long's correction was found to be invalid in the range of temperatures studied. The hygrometer is very convenient for use in humidity investigations, particularly where a small instrument is required.
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Gordon W. Smith (1953) studied this question.
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