Chemical News and Journal of Industrial Science . be, 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 iscompletel
Chemical News and Journal of Industrial Science . be, 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 benzene inthe bulb has been used inthe thermostat of a polari- Fig. 4. meter, and no change could be detected with a Beckmann thermometer during a dayor Adjustment for Alteration of Temperattire.—The adjust-ment of the regulator for a different temperature is usuallyeffected by removal or addition of mercury through a sidetube, fitted with a glass tap. The ease of adjustmentvaries with the particular tap, and is sometimes troublesome. A. Slator describes another method of altering the mer-cury level (jfoiirn. Soc. Chem. Ind., igii, xxx., 6i) 3 shows the upper part of the regulator, and does notinclude the toluene bulb. The glass rod plunger, A, passesthrough the rubber bung, b, and forces the desired amountof mercury into the stem, k, of the apparatus. The cup, d,is filled to the exclusion of all air by a mixture of about twoparts glycerin and one of water. The bung, b, rests onthe cup, and is held in position by the rubber tubing, c,which overlaps the bung and the cup. The plungerreadily slides through the bung owing to the efficientlubrication by the glycerin and water, and t
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