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See also:HYGROMETER (Gr. hypos, moist, L Tpov, a measure) , an See also:instrument for measuring the See also:absolute or relative amount of moisture in the See also:atmosphere; an instrument which only qualitatively determines changes in the humidity is termed a " hygroscope." The earlier See also:instruments generally depended for their See also:action on the contraction or See also:extension of substances when exposed to varying degrees of moisture; See also:catgut, See also:hair, See also:twisted cords and wooden laths, all of which See also:contract with an increase in the humidity and See also:vice versa, being the most favoured materials . The See also:familiar " See also:weather See also:house " exemplifies this See also:property . This See also:toy consists of a house provided with two doors, through which either a See also:man or woman appears according as the weather is about to be wet or See also:fine . This action is effected by fixing a catgut See also:thread to the See also:base on which the figures are mounted, in such a manner that contraction of the thread rotates the figures so that the man appears and extension so that the woman appears . Many of the See also:early forms are described in C . See also:Hutton, Math. and Phil . See also:Dictionary (1815) . The See also:modern instruments, which utilize other principles, are described in See also:METEOROLOGY : H . Methods and Apparatus . |
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