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A new type of electric hygrometer, the “carbon film element” is described. Its response to humidity changes is by electronic rather than electrolytic conduction. Main features of the new element are: high sensitivity to moisture changes, rapid response, absence of polarization effect, and a calibration independent of temperature between 0° and 40° C. Components of the carbon film, performance data, and manufacturing techniques are described.
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Smith et al. (1954) studied this question.
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