Chemical News and Journal of Industrial Science . Liquid. Water 40 per cent calcium chloride solution Mercury Benzene Toluene Ethyl alcohol Ethyl ether Chloroform Carbon tetrachloride Increase in volume of I litre for i^ rise in temperature. Cc. 0-25 0-5 o It1-2 i3 Specificheat. 10 0-63 0-03 0-4 0-4 0-5 0-550230-2 The very low spcc-fic heat of mercury is counterbalanctdby its great density, which necessitates the use of thick-walled apparatus. Most organic liquids show an expansionv/ith temperature of the same order as those quoted, but. Fig. 2. paraffin oils are much lower and are unsuitable.
Chemical News and Journal of Industrial Science . Liquid. Water 40 per cent calcium chloride solution Mercury Benzene Toluene Ethyl alcohol Ethyl ether Chloroform Carbon tetrachloride Increase in volume of I litre for i^ rise in temperature. Cc. 0-25 0-5 o It1-2 i3 Specificheat. 10 0-63 0-03 0-4 0-4 0-5 0-550230-2 The very low spcc-fic heat of mercury is counterbalanctdby its great density, which necessitates the use of thick-walled apparatus. Most organic liquids show an expansionv/ith temperature of the same order as those quoted, but. Fig. 2. paraffin oils are much lower and are unsuitable. It ismainly a matter of convenience which of the above organicliquids is used, but that with the lowest density will beslightly more efficient than the others. Bulb 0/ Regulator.—The greater the surface exposed,the more sensitive will be the regulator; consequently,several have recommended the use of a spiral to containthe liquid (Gouy, yourn. de Phys., 1897, [3], vi., 479, andothers). Lowry has described a convenient form of spiral{Trans. Chem. Soc, 1905, Ixxxvii., 1030). The sensitiveness of the regulator is increased by use ofa metal spiral instead of glass, and a satisfactory con-nection can be made with rubber, if a water trap is intro-duced between mercury and the organic liquid, so that thewater layer covers the junction between metal and glass. Method of Cutting off the Gas Supply.—Two forms ofcut-offwith novel features may be mentioned. That 3o8 Thermostats. I Chemical ^JEWs,I Dec. 29, 1911 described by W. Heber Gre
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