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- Psychrometer An instrument used for measuring the water vapor content of the atmosphere; a type of hygrometer. It consists of two thermometers, one of which (the dry bulb) is an ordinary glass thermometer, while the other (wet bulb) has its bulb covered with a jacket of clean muslin which is saturated with distilled water prior to an observation. When the bulbs are suitably ventilated, they indicate the thermodynamic wet- and dry-bulb temperatures of the atmosphere. One variety is the Assman psychrometer (a special form of aspiration psychrometer for which the ventilation is provided by a suction fan).
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- Accuracy, Air temperature, gastropod, Hygrometer, Instrument shelter, instrumental record, Scale, Shield, Thermograph, Thermometer