e bottom of which a tube descendsinto an open beaker or bottle contain-ing coloured liquid. By heating thebulb some of the air is forced outthrough the liquid. As the air coolsthe liquid rises in the tube, becomingstationary when the temperature hasbecome constant. If the tempera-ture changes… … Fig. 9. 24. The differential Air Thermometer. In one of its forms this instrument con-sists of two bulbs with a tubejoining them, bent as ABODE infig. 10. The portion BCD con-tains coloured liquid which, solong as the two bulbs are at thesame temperature, stands at thesame level within the tubes.…
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