Journal . y requiring evaporationdown to the proper strength. The cartilaginous shreds thus obtained differ muchin their general physical character from the originalunconverted castor oil, being practically insoluble inthe various menstrua in which the latter glyceridic character, however, is not whollydestroyed; thus notable quantities of impure glycerolBUI be obtained by long-continued boiling withalcoholic potash of the shreds, previously completelyfreed from all traces of unconverted oil by repeateddigestion with carbon disulphide. IMPROVED FILTERING FUNNELS. BY B. NICKELS, P
Journal . y requiring evaporationdown to the proper strength. The cartilaginous shreds thus obtained differ muchin their general physical character from the originalunconverted castor oil, being practically insoluble inthe various menstrua in which the latter glyceridic character, however, is not whollydestroyed; thus notable quantities of impure glycerolBUI be obtained by long-continued boiling withalcoholic potash of the shreds, previously completelyfreed from all traces of unconverted oil by repeateddigestion with carbon disulphide. IMPROVED FILTERING FUNNELS. BY B. NICKELS, The usual devices for accelerating filtration are wellknown to chemists, but they all have the dis-advantage of leaving certain parts of the filter paperwithout any support at the back, causing thereby agrave risk of breakage of the paper. Fig. 1 repre-sents a double funnel, the inner attached to the outerby means of suitable ribs or projections placedat intervals. The inner funnel is perforated with. liquor, which immediately makes its way, throughthe holes, to the back of the filter paper, quickly andthoroughly washing the same. Fig. ?$ is for use in connection with aspirator water or other pump : theusual hollow platinum cone is unnecessary ; the per-forations in the inner funnel, being very small butnumerous, admit of a high vacuum being employedwithout risk of breaking the paper,and filtration is con-ducted with very great rapidity. I lialysing, as usuallyconducted, is troublesome, owing to the difficulty ofmaking a tight joint with the parchment paper to theproof containing the liquid to be dialysed. All thatis necessary with this funnel is to attach a tube andsb p-cock to the end, and place a piece of parchment holes in a downward direction. Fig. 3 is similarto Fig. 1, with the exception that the space betweenthe two funnels at the top is closed, with a stop-cockfor admission of air, and for cleaning filtration with these funnels is greatlyquicken
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
