Journal . ed it passes directly over the mouths at the stopper is hollow, and is bored with holes whichcoincide with the oi)eniug of the side tube i, when the endof the stopper is just above the corresponding mouth atthe bottom of the vessel N. The distillation condenser tubeis connected with the side tube /, whilst / communicateswith the vacuum apparatus. The various fractions of dis-tillate are collected in the several receivers by turning thestopper S at the desired periods. The is useful forconducting fractional distillation in various gases, and wherethe smell of the
Journal . ed it passes directly over the mouths at the stopper is hollow, and is bored with holes whichcoincide with the oi)eniug of the side tube i, when the endof the stopper is just above the corresponding mouth atthe bottom of the vessel N. The distillation condenser tubeis connected with the side tube /, whilst / communicateswith the vacuum apparatus. The various fractions of dis-tillate are collected in the several receivers by turning thestopper S at the desired periods. The is useful forconducting fractional distillation in various gases, and wherethe smell of the substance may be objectionable. It may-be obtained from Alt, Eberhard, and Jager, Ilmenan,Thiiringcn.— G. H. B. On Constant Ct<is Siippli/, ami the Apparatus necessart/ therr/nr. PoUak and Wilde (conclusion). Chcm. Zeit. 12, 750—.jT. (For previous paper, see Chem. Zeit. Iti88, G95.) (I.) Evolution nf Iliidroyen.—The apparatus used is that shown in the cut. About one and a half kilos, of sheet zinc. in pieces about i sq. cm. in area are placed in the annularspace A, and hydrochloric or sulphuric acid of about fivetimes normal strength, containing 10 ec. Cobalt chloridesol. per litre is allowed to flow on to it from the globularfunnel B, by turning the cocks C and D and the stopper E,so as to permit the transference of the expelled gas fromthe lower vessel to the upper by means of the tube F (afterthe manner of a percolator). The tube of the stopper E being prolonged nearly to thebottom of the funnel, serves to maintain a constant head,acting on the principle of a Slarriottes bottle, which, indeed,may be substituted for it when the apparatus is to be usedcontinuously for a long period. The U tube G, filled with mercury, is designed to allow theescape of any small quantity of gas evolved after cutting offthe supply of acid if the cock on the exit tube H shouldhappen to be closed. The solution of zinc salt, as it fonns, through theholes in the inner tube K, and ris
Size: 903px × 2768px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
