Abstract
Two inexpensive cooled-mirror instruments have been designed for the determination of dew-points and frost-points down to -50 degrees C or lower with an accuracy of approximately +or-1 degrees C at that order of frost-point. Measurement errors and effects of operator technique have been made small, firstly by a combination of design features and secondly by a modified method of interpreting the temperature readings. In addition, in one of the two instruments described observational difficulties have been minimized by a design that results in one localized cold spot of accurately measured temperature on an otherwise apparently unbroken mirror surface; this latter instrument is particularly suitable for site use and by inexperienced personnel.
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