SPRING-WOUND PSYCHROMETER, GOST 6353-52 AND ELECTRIC PSYCHROMETER M-34.
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER WASHINGTON D C
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These articles describe two almost identical wet and dry bulb comparison psychrometers. In each unit, a fan draws the surrounding air up through a tube past the wet and dry bulb thermometers, and tables or a special graph are used to determine the humidity, both relative and absolute, of the air. The essential difference between the two instruments is that one is spring-wound, the other has an electric motor. Author