. Bulletin . combustion and explosion methods in gas analysis: Jour. Ind. Eng. Chem., vol. 13, 1921,p. 11-54. = Hulett, G. A., The distillation of amalgams and the purification of mercury: , vol. 34, 1911, p. 307. ANALYSIS OF MINE ATMOSPHERES 59 tube is drawn out fine at the lower end. This tube is slipped intothe tube h as indicated in the figure. The joint i, where tliere is aslight enlargement of the tube c, is made tight with rubber bandsabout 1 cm. wide, which are wrapped about the joint while asbestos shields s deflect the hot gases so that this joint nevergets war
. Bulletin . combustion and explosion methods in gas analysis: Jour. Ind. Eng. Chem., vol. 13, 1921,p. 11-54. = Hulett, G. A., The distillation of amalgams and the purification of mercury: , vol. 34, 1911, p. 307. ANALYSIS OF MINE ATMOSPHERES 59 tube is drawn out fine at the lower end. This tube is slipped intothe tube h as indicated in the figure. The joint i, where tliere is aslight enlargement of the tube c, is made tight with rubber bandsabout 1 cm. wide, which are wrapped about the joint while asbestos shields s deflect the hot gases so that this joint nevergets warm, even to the hand. The joint is much simpler than aground joint, which may be used. The glass cock regulates the rate at which the air bubbles throughthe mercury in the still, and if it is properly ground no grease needbe used on it. The end of the condensing tube e is sealed to thestopper of an ordinary Drexel washing bottle. The outlet tubefrom the Drexel bottle / is joined to an ordinary Sprengel suction. FiGDED 19.—Gas-heated mercury still. For explanation, see text pump and a manometer, and a vacuum of 25 to 30 mm. is main-tained in the system while air is bubbling through the mercury inthe still. When the still is once imiformly in operation it needslittle attention, and 2 kg. of mercury may be distilled in 2 or3 hours. Steady gas and water pressures are desirable. The groundjoints may readily be made tight enough by a little grindingwith fine emery, if they are not satisfactory at the start. The rub-ber joint at d never gives trouble if the tube fits well in the neckof the flask. DESCRIPnOX OF STILL WITH ELECTRIC HEATER In distilling large amounts of mercury it has been found necessaryto use a larger still provided with an electric heater and so arranged 60 i^AMPLING AND EXAMINATION OF GASES that mercury can he introduced during distillation. Figure 20 pre-sents the main features of the still. The flask a is about 15 diameter, and jfito the bottom is sealed the
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