. A treatise on pharmacy .. . 296 ON DISTILLATION, ETC. Such, an apparatus is particularly adapted to distilling water for phar-maceutical use, also rose-water and the alcoholic solution of essentialoils, called spirits. If of sufficient capacity, it is adapted to the distilla-tion of essential oils. The chief obstacle to its general use for thevarious purposes of the pharmaceutist lies in the comparative difficultyof depriving the condensing worm of the odor of different substancesdistilled and the consequent liability of these to contaminate the nextsucceeding distillate. Kg. 175 represents
. A treatise on pharmacy .. . 296 ON DISTILLATION, ETC. Such, an apparatus is particularly adapted to distilling water for phar-maceutical use, also rose-water and the alcoholic solution of essentialoils, called spirits. If of sufficient capacity, it is adapted to the distilla-tion of essential oils. The chief obstacle to its general use for thevarious purposes of the pharmaceutist lies in the comparative difficultyof depriving the condensing worm of the odor of different substancesdistilled and the consequent liability of these to contaminate the nextsucceeding distillate. Kg. 175 represents a vessel of tinned iron which I have used as asubstitute for a glass retort in operations in which no corrosive or acidsubstance enters into the liquid to be distilled. Near the top of a deeptin vessel is soldered on a small gutter, so arranged on its inside as Fig. Tin retort with water j oint. not to reach quite up to the level of the sides of the vessel. The top,h, has a rim • projecting downwards, which sets into this gutter, asshown at c, in the section. When about to use this, after charging itwith the substance to be distilled, the little gutter is filled with waterand the top fitted on. The water joint thus formed prevents the escapeof any portion of the vapor, while it is prevented from becomingempty by the moisture condensed on the inside of the conical topdropping into it as it This may be used in connection with any means of refrigeration athand, such as a worm and tub, or a Liebigs condenser, figured in thefirst chapter on Pharmaceutical Chemistry. Its chief advantages consistin the absence of bumping, a phenomenon which interferes with theuse of glass retorts, and its freedom from the liability to fracture. Inusing it, however, care must be taken to withdraw the heat as soon asthe required quantity of liquid has been di
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectpharmacy, bookyear186
