Journal . is apparatusit is an easy matter to filter liquids containing hydro-fluoric acid, by using a platinum funnel and filteringdirectly into a platinum basin or other platinumvessel. The apparatus as above described has been ingeneral use in the Chemical Laboratories of the University of Edinburgh for the last four or five years,and has been proved to meet the simplest require-ments of qualitative analysis equally with those ofthe most exact quantitative analysis. The following has been found a convenient methodof preserving sulphurettedhydrogen water. The bottleA (Fig. 14) is filled up t
Journal . is apparatusit is an easy matter to filter liquids containing hydro-fluoric acid, by using a platinum funnel and filteringdirectly into a platinum basin or other platinumvessel. The apparatus as above described has been ingeneral use in the Chemical Laboratories of the University of Edinburgh for the last four or five years,and has been proved to meet the simplest require-ments of qualitative analysis equally with those ofthe most exact quantitative analysis. The following has been found a convenient methodof preserving sulphurettedhydrogen water. The bottleA (Fig. 14) is filled up to theneck with the sulphurettedhydrogen water. The double-bored stopper bearingthe tubes a, a, a and b, b, b is then loosely tube a, a, a is then connected with the ordinarycoal-gas supply, and the air in the neck of the bottledisplaced by gas. While this is taking place, suctionis applied at the end or ends of the tube 6, >>, b, soas to convert it into a syphon, after which it is closed. Fig. XIV. by an ordinary nipper tap. The stopper is now firmlypressed into the neck of the bottle. By this arrange-ment the sulphuretted hydrogen solution is preservedfrom oxidation, and can always be run off perfectlyclear, even though left standing for months. By theuse of a T tube, as shown in the figure, the sulphur-etted hydrogen solution can be supplied from onebottle to both sides of a working table. The gas tapshould, as a rule, be kept closed, and need only beopened for an instant whenever the sulphurettedhydrogen water ceases to flow. The tap should belubricated with vaseline, and not with grease. Shouldthe sulphuretted hydrogen water become turbid, itmay be safely concluded that air has leaked in owingto some imperfection in the rubber connections. journal ant) Ipatcnt* literature. L—GEHMAI PLANT, APPARATUS, ANDMACHINERY. Improvements in Apparatus for Purifying Water. Allison, London. From J. H. Blessing, Albauv, Eng. Pat. 15,215, Nov. 23, 18S6. 8d. T
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
