. Journal. er. Fig. 1 represents the bulb tube with extremitiesbent in opposite directions. Fig. 2 shows the weighedbulb in position for filling itself to any given mark orpoint in the upper stem, from a bottle containing theanhydride specimen. The bent limb, projectingabove the neck of the bottle, is then convenientlysituated for closing with the blow-pipe flame. Afterclosing in this manner, the bulb is withdrawn, whilstthe extremity is still warm, and thus no anhydride can be forced out at the opposite and previously sub-merged extremity, as the fingers will be cooler thanthe place touched i
. Journal. er. Fig. 1 represents the bulb tube with extremitiesbent in opposite directions. Fig. 2 shows the weighedbulb in position for filling itself to any given mark orpoint in the upper stem, from a bottle containing theanhydride specimen. The bent limb, projectingabove the neck of the bottle, is then convenientlysituated for closing with the blow-pipe flame. Afterclosing in this manner, the bulb is withdrawn, whilstthe extremity is still warm, and thus no anhydride can be forced out at the opposite and previously sub-merged extremity, as the fingers will be cooler thanthe place touched in the withdrawal from the hiving reversed the position of the extremities of thebulb, the other limb is in like manner closed with the1 ilow-pipe flame, when after cleansing and wiping dry,the bulb is weighed again. It is next cautiously in-serted in the bottle (Fig. 3), and gently induced to takethe position indicated, some pure water being intro-duced about the level shown in the cut. The stopper. Fig. 2. Fig. 3. is then adjusted, and the bottle being taken in thehand is so held that the former is firmly kept in itsplace. One vigorous shake now suffices to break thebulb in the bottle, and in this there is no danger,only a sudden vibration being felt at the instant theanhydride comes in contact with the water. A whitecloud is observed on the sides of the bottle, but by atew gentle shakes a perfect solution is obtained, andafter allowing the bottle to cool, it may be openedand the analysis at once commenced. First SOo,always present to some extent, is determined by titra-tion with iodine solution, and then the SOa after pre-cipitation as barium sulphate, though as a rule volu-metrically. A. Boake & Co., London {Group XIV. No. 1467). This firm exhibits a complete collection of productsconnected with the sulphurous acid industry. Lique-fied sulphurous anhydride is a speciality of the firm,and in the glass syphons arranged to deliver eitherthe liquid or gaseous acid as de
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
