differential air thermometer

differential air thermometer

[‚dif·ə′ren·chəl ′er thər′mäm·əd·ər]
(engineering)
A device for detecting radiant heat, consisting of a U-tube manometer with a closed bulb at each end, one clear and the other blackened.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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