. Carnegie Institution of Washington publication. EXCLUSION OF AIR FROM AMALGAMS. 19 The amalgams made up by the method described above were separated from the supernatant liquid and bottled up clean and dry in suitable reser- voirs with the help of the device shown in figure 2. G is a hydrogen generator of the Richards type, in which hydrochloric acid containing about 8 per cent of the anhydrous gas and the best obtainable grade of granulated zinc were used. A trace of cupric chloride was added to hasten the action. The gas thus obtained was purified by passing it through three Emmerling towe
. Carnegie Institution of Washington publication. EXCLUSION OF AIR FROM AMALGAMS. 19 The amalgams made up by the method described above were separated from the supernatant liquid and bottled up clean and dry in suitable reser- voirs with the help of the device shown in figure 2. G is a hydrogen generator of the Richards type, in which hydrochloric acid containing about 8 per cent of the anhydrous gas and the best obtainable grade of granulated zinc were used. A trace of cupric chloride was added to hasten the action. The gas thus obtained was purified by passing it through three Emmerling towers, Elf E2} and E3, each 50 cm. high and 5 cm. in diameter, filled with glass pearls moistened with a very strong solution of pure caustic soda. The gas thus obtained contains no acids that might attack the amalgams, and is. Fig. 2.—Device for Preserving Amalgams. fairly dry. The pipette B is fused at A to the delivery tube, and also communi- cates with the vacuum through H and V. The outlet tube of B, terminating in a thick-walled capillary, passes through the rubber stopper K into the flask F, which is provided with two sidenecks, C and D; C is fused to an open capillary, and D is connected with the aspirator. St, S2, Sz, S4, S5, and S6 are glass stopcocks well lubricated with paraffin-rubber lubricant. The only rubber in the apparatus proper, the stopper K, was boiled with sodic hydroxide solution and several portions of distilled water; before using it was covered with soft paraffin. The consistent use of fused joints prevents leakage and the introduction of sulphur compounds from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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