The practice of pharmacy : a treatise on the modes of making and dispensing official, unofficial, and extemporaneous preparations, with descriptions of their properties, uses, and doses intended as a hand-book for pharmacists and physicians and a text-book for students / [Joseph Price Remington].

  • Remington, Joseph P. (Joseph Price), 1847-1918.
Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: The practice of pharmacy : a treatise on the modes of making and dispensing official, unofficial, and extemporaneous preparations, with descriptions of their properties, uses, and doses intended as a hand-book for pharmacists and physicians and a text-book for students / [Joseph Price Remington]. Source: Wellcome Collection.

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    tilled and aromatic waters often possess, and which is usually caused by the solid substances lying in immediate contact with the hot still bottom, is obviated in this still by putting the substance into a hemispherical, coarse wire-sieve cage (see Fig. 182): the round bottom of the cage prevents any possibility of contact with the flat bottom of the still, whilst circulation of the water and vapor takes place through the meshes ; a handle serves to lift it out when the distillation is completed. Fig. 183 shows a dissected view of the still, which illustrates the relative Fig. 183. A Wire cage. Pharmaceutical still (sectional view). Fig. 184. position of the parts,—D, the still body; N, tube level; L, clamp; C, water-bath; W, condenser; B, cold-water tube; A, exit-tube for warmed water. A very useful automatic water still, devised by Herrick, is illustrated by Fig. 184. The lower vessel is the boiler, the middle one the con- denser tank, the upper one the supply tank pro- vided with a loose cover. Of the four pipes shown, A is the steam and condensed water tube, coiled, as shown in the condenser tank full of water, and delivering distilletl water at A'; B is a pipe lead- ing from the water level in the boiler to the top of the supply tank; C, a pipe, with cock, leading from the bottom of supply tank to the condenser tank; and D, a pipe leading from the top of the condenser tank to bottom of boiler. E is an open- ing, with air-tight stopper, for filling supply tank ; and F, a cock to draw off hot water from boiler. The distillation of water proceeds, after it is once started, automatically. The advantages possessed by such a still are that a constant supply of dis- tilled water can be furnished at a minimum cost. It can be operated by a gas flame, coal-oil stove, or by placing it upon the top of a range or stove, or in fact by any source of heat, and a very little care suffices to keep it running. It is, of course, only suited for distilling one liquid like water, where a constant supply of liquid can be maintained, and is not in- tended to be used for general pharmaceutical work, such as recovering alcohol from weak percolates, etc. Automatic water still.