. Practical physical chemistry . tion, and fit it with a paraffinedcork or india-rubber stopper, bored with two holes. Throughone of these pass the end of a soda-lime tube, and through theother a bent glass tube, one end of which reaches nearly to thebottom of the bottle, while the other end is connected by meansof india-rubber tubing, carrying a spring clip, to the side tubeof the burette B. The upper end of the burette is closed byan air-tight cork through which passes a soda-lime tube, D,fitted with rubber tubing carrying a glass mouthpiece. Theburette may be clamped free from the bottle in
. Practical physical chemistry . tion, and fit it with a paraffinedcork or india-rubber stopper, bored with two holes. Throughone of these pass the end of a soda-lime tube, and through theother a bent glass tube, one end of which reaches nearly to thebottom of the bottle, while the other end is connected by meansof india-rubber tubing, carrying a spring clip, to the side tubeof the burette B. The upper end of the burette is closed byan air-tight cork through which passes a soda-lime tube, D,fitted with rubber tubing carrying a glass mouthpiece. Theburette may be clamped free from the bottle in an ordinaryburette or retort clamp, or may be, very conveniently, fixedto the bottle by means of an Ostwald burette clamp (Fig. 52).The wider ring is clamped round the neck of the bottle, whilethe smaller ring holds the burette. Having closed the lower end of the burette, attach the DISTRIBUTION OF SUBSTANCES 163 soda-lime tube on A to a filter pump, and draw a current ofair (freed from carbon dioxide by means of the soda-lime). Fig. 51.
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