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Unformatted text preview: Carius tubing cautiously in the blowpipe flame, starting first with a smoky flame and then increasing the proportion of air until a flame of maximum temperature is obtained, meanwhile rotating the horizontal tube (using both hands simultaneously, and not each hand in turn, for the rotation) in order to secure uniform heating. When the middle portion of the tube is quite soft, draw the two portions of the tube apart, so that two tubes similar to A (Fig. 72) are obtained, each being open at one end and drawn out to a fine tail at the other. Two Carius tubes can thus be made, although only one will be * A practical demonstration of the preparation and sealing of Carius tubes is of vastly greater value than any written description. FIG. 72....
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- Fall '06
- Organic chemistry