Chemical News and Journal of Industrial Science . type are in use in Edinburgh andAberdeen, and are much superior to those with cement(made by Eraser, 16, Haddon Street, Aberdeen). Flow of Liquid at Constant Temperature.—A thermostatarranged to supply a stream of water at constant tempera-ture is described by Lowry {Trans. Faraday Soc, 1907,iii., 119). the value of the thermostat depends on the con-stancy of the temperature, it is natural that many varietiesof regulators should be described. In all modern forms,the expansion of a liquid is used to actuate a cut-off for theheat
Chemical News and Journal of Industrial Science . type are in use in Edinburgh andAberdeen, and are much superior to those with cement(made by Eraser, 16, Haddon Street, Aberdeen). Flow of Liquid at Constant Temperature.—A thermostatarranged to supply a stream of water at constant tempera-ture is described by Lowry {Trans. Faraday Soc, 1907,iii., 119). the value of the thermostat depends on the con-stancy of the temperature, it is natural that many varietiesof regulators should be described. In all modern forms,the expansion of a liquid is used to actuate a cut-off for theheat supply. Choice0/ a Liquid. -The liquid to be used in the regulatorshould have a low specific heat, a high coefficient ofexpansion, and preferably a low density. As these are themain factors in the choice of a liquid, a few figures may begiven for the specific heats and coefficients of expansion ofsome common liquids. The numbers are approximate,and refer to temperatures about 25°. * A Paper read before the Faraday Society, December 6, 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
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