. Practical physical chemistry . mperatures over 100° andup to 140°-!50°, a concentrated solution of calcium chloridecan be employed. Constant Level Apparatus.—When the temperature is fairlyhigh, or when the bath is to be in use for a considerable time, it is convenient to have someI ^ arrangement for repairing loss byevaporation and maintaining thelevel of the water in the thermo-stat. This can be effected invarious ways. A side tube ofthe form shown in Fig. 15 maybe permanently attached to thebath; water passes into the sidetube and the bath through a, andthe excess flows out through b:The w
. Practical physical chemistry . mperatures over 100° andup to 140°-!50°, a concentrated solution of calcium chloridecan be employed. Constant Level Apparatus.—When the temperature is fairlyhigh, or when the bath is to be in use for a considerable time, it is convenient to have someI ^ arrangement for repairing loss byevaporation and maintaining thelevel of the water in the thermo-stat. This can be effected invarious ways. A side tube ofthe form shown in Fig. 15 maybe permanently attached to thebath; water passes into the sidetube and the bath through a, andthe excess flows out through b:The water is therefore maintainedat the level of the upper end of when the thermostat is not furnished with thisconstant-level apparatus, the same device, in a modified form,can readily be made from ordinary laboratory materials andused with any thermostat. This form of the apparatus is shownin Fig. 16. This apparatus is constructed of glass tubing fitted togetheras shown in the figure. Before using, the tubes E, F, and D. \ THERMOSTAT yj are filled with water; and after the tube B has been filled with water up to the end of the waste-pipe C, water will syphon off from B into I he thermostat W, until the level of the water in the latter rises to that in the tube B. The apparatus then acts in exactly the same manner as that shown in Fig. 15. The tube E, it may bementioned, is necessary inorder to act as an this means the blockingof the syphon tubes by air-bubbles given off from thewater is prevented. Whentoo much air be-gins to collect in zjn:i~. E, it can be re- ~- moved by sucking —? through the rubber tube Gwhich is ordin-arily closed bymeans of a screw-clip. Regulation ofthe Temperature. —When temperatures above that of the surroundings are tobe maintained, heat must be added to the bath. This isgenerally effected by means of a gas flame, the size ofwhich is automatically regulated by means of a thermo-regulator.
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