Chemical News and Journal of Industrial Science . 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 tra
Chemical News and Journal of Industrial Science . 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 Green (Chemical News, 1908,xcviii., 49) has been tried in the laboratory of the Universityof Edinburgh, and found to effect a considerable improve-. FiG. 3. ment. The inlet tube for the gas is pushed down untilalmost touching the constriction in the outer tube, as shownin Fig. I. The lower endof the inlet tube is openedout slightly, and thetendency of mercury to stickin the narrow tube is thusprevented. The regulatorcan be adjusted for anydesired temperature by re-moval or addition ol mer-cury through a side tubewith glass tap (similar toarrangement shown inFig. 2). The apparatus shown inFig. 2 was designed byT. S. Patterson ( hid., igo2, xxii.),and its particular merit isthat it prevents the forma-tion of scum on the mer-cury surface. The top ofthe inner tube A, which iscompletely filled with mer-cury, is covered with a thinrubber sheet ; the expansionof the liquid with ri^e oftemperature presses thisrubber against the inlettube, and thus closes Patterson has used thistype of regulator for tenyears and finds it very satis-factory. One regulatorwith 80 cc. of
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