. A treatise on pharmacy .. . is acone of hat felt, projecting upwards fromnear the bottom of the lower vessel. Thisis arranged on a projecting ledge, pene-trated with six holes with threads cut inthem, in which fit pointed thumb-screwswith shoulders. On this ring fits a similarone of somewhat less diameter, furnishedwith corresponding holes, through whichthe thumb-screws readily pass as far asthe shoulders, and are thus capable ofbinding the two rings closely felt filter, having been cut to the dia-meter of the vessel, is slipped down so asto rest evenly upon the lower ring, theu
. A treatise on pharmacy .. . is acone of hat felt, projecting upwards fromnear the bottom of the lower vessel. Thisis arranged on a projecting ledge, pene-trated with six holes with threads cut inthem, in which fit pointed thumb-screwswith shoulders. On this ring fits a similarone of somewhat less diameter, furnishedwith corresponding holes, through whichthe thumb-screws readily pass as far asthe shoulders, and are thus capable ofbinding the two rings closely felt filter, having been cut to the dia-meter of the vessel, is slipped down so asto rest evenly upon the lower ring, theupper is then placed over it so as to avoidWarners oil filter. overlapping of the felt, and then the thum- screws, being pressed through the felt, aresecurely screwed into the lower ring, which binds the rings so closelyas to make a tight joint; the lower vessel is also supplied with a stop-cock at / to draw off the filtered oil. The stopcock c being closed,the upper vessel is fitted in its place, and the tube joint e rendered. THE SIPHON. 105 tightby wrapping with isinglass plaster; when this is dry the upperel is filled with the oil and the stopcock a opened. The appa should be placed near a source of heat, so that it may reach 120° F.,and as the filtered oil accumulates above the felt, it should be drawnoff so as not to retard the process. The advantage is gained in this appa-ratus of the impurities settling away from the filter rather than accumu-lating upon it. It is the invention of William K. Warner, of Phila-delphia. One of this size is capable of filtering a barrel of oil in a day. This process is called straining, though a kind of filtration. Inpharmacy, infusions, decoctions, syrups, fixed oils, and melted oint-ments are subjected to it in order to separate foreign pass through the strainer with much greater facility when quitehot, though in the case of the fixed oils and syrups, clearer productsare obtained by conducting the operation in the cold, a
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectpharmacy, bookyear186
