A Simple Laboratory Apparatus for the Continuous Evaporation of Large Volumes of Liquid in vacuo

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Abstract
It is frequently necessary, especially in dealing with plant and animal extracts, to concentrate large volumes of liquid in vacuo. In such cases, the operation is often a very tedious one, owing to the necessity of closely watching the apparatus so as to control frothing and avoid the passing over of the liquid into the distillate. Having experienced this, more particularly in the distillation of alcoholic plant extracts, which show a great tendency to froth, the simple apparatus shown in the sketch has been devised which completely overcomes all the difficulties encountered in such work.

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