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sling psychrometer[′sliŋ si′kräm·əd·ər]
A psychrometer in which the wet- and dry-bulb thermometers are mounted upon a frame connected to a handle at one end by means of a bearing or a length of chain; the psychrometer may be whirled in the air for the simultaneous measurement of wet- and dry-bulb temperatures.
A psychrometer to which a handle is attached; the apparatus is whirled in the air until the reading of the wet-bulb thermometer reaches a constant value.
An instrument used to measure the amount of water vapor or relative humidity in the air. It is a combination of wet- and dry-bulb thermometers mounted on a frame with a handle that allows it to be swung around to permit air to move across the psychrometer. See psychrometer.