atat which the dew appeared; and the mean of the two willgive a more accurate value for the dew-point. 133. Regnaults Hygrometer. This consists of athin silver tube, fig. 59, like a short test tube mounted on astand. Two small tubes A and B (fig. 59 a) enter the largertube, one of them B opening… … Fig. 59. Fig. 59 4. 132-134] CHANGE OF STATE. LIQUID TO VAPOUR. 153 is partly filled with ether, covering the thermometer bulb, andair is caused to bubble through the ether either by blowing itin with a pair of bellows through B, or sucking it out with apump, through A. This produces evaporation of…
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