Abstract
The psychrometer and hair hygrometer are common means of determining the moisture content of the air, but when humidity readings are to be made or recorded graphically, remote from the point of measurement, or where humidity must be detd. rapidly or in confined spaces or at low temps., these methods are not deemed practical. This paper describes a type of electric hygrometer which better fulfills these requirements, covering improvements made on an earlier type previously descr. by the author.

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