. American journal of pharmacy. reparatory to ex-tracting their juices or to acting on them with menstrua. Heobserves that the most effectual mode of crushing herbs (such as PHARMACEUTICAL GLEANINGS. hyoscyamus, &c.) for extract, was by means of the stones of adrug mill, which, however, did the wort so effectually that therewas reason to believe the amount of product was increased by aportion of the vegetable fibre being reduced to a fine pulp andpressed out with the juice. Those who sent their herbs to a millto be crushed, suffered the inconvenience of delay in the process,which was objection
. American journal of pharmacy. reparatory to ex-tracting their juices or to acting on them with menstrua. Heobserves that the most effectual mode of crushing herbs (such as PHARMACEUTICAL GLEANINGS. hyoscyamus, &c.) for extract, was by means of the stones of adrug mill, which, however, did the wort so effectually that therewas reason to believe the amount of product was increased by aportion of the vegetable fibre being reduced to a fine pulp andpressed out with the juice. Those who sent their herbs to a millto be crushed, suffered the inconvenience of delay in the process,which was objectionable, as the juice ought to be evaporated assoon as expressed. Mr. Bell had tried several experiments witha view of obtaining a substitute for a drug mill. One of thesehad a pair of mill-stones about two feet six in diameter, workingon a fiat stone and turned by hand. This did not answer as thestones were not heavy enough to crush the harder portions ofthe plant, and the labor of working the machine by hand was too Fig. great. Another machine was contrived having two cylindersbetween which the herbs were crushed. As there was no contri-vance for approximating the cylinders, according to circumstan-ces, this did not answer, as some portions of the herbs and rootspassed through without being crushed, while other portionswould not pass at . all. By the assistance of Mr. Coffey, ma-chinist, he had a machine (fig, 14,) made which was the best he PHARMACEUTICAL GLEANINGS. 13 had seen. It has a contrivance by which the distance betweenthe cylinders can be regulated at will by two screws with wheelsattached, with their circumference divided, and numbered so thatthe operator can tell at a glance how far they are apart. Bythis means, in crushing taraxacum for instance, the process canbe commenced with the cylinders so far apart as to draw in thelarger roots, and afterward the process repeated with the cylin-ders closer together. The cylinders are of cast iron, but may bemade of gun
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
