. An introduction to practical pharmacy [microform] : designed as a textbook for the student and as a guide to the physician and pharmaceutist : with many formulas and prescriptions . of delicate flavor, as orris root and vanilla. , . . , ~ The plan of dusting powders, which insures their extreme fine-ness, and the separation of any earthy impurity, has greatly gainedin favor of recent time. The apparatus now used is not figured inany of the books, as far as I have observed; it is constructed so thatthe powdered drug, when it has passed between the grinding sur-faces, is thrown by a draught, a
. An introduction to practical pharmacy [microform] : designed as a textbook for the student and as a guide to the physician and pharmaceutist : with many formulas and prescriptions . of delicate flavor, as orris root and vanilla. , . . , ~ The plan of dusting powders, which insures their extreme fine-ness, and the separation of any earthy impurity, has greatly gainedin favor of recent time. The apparatus now used is not figured inany of the books, as far as I have observed; it is constructed so thatthe powdered drug, when it has passed between the grinding sur-faces, is thrown by a draught, artificially created below, to a height ofabout five feet, and is then allowed to settle upon the adjacent parts,from which, after it has collected in sufficient quantity, it is will be appropriate, in this place, to give some observationsupon powdering, as practised, on a small scale, in the shop andlaboratory. This is accomplished by means of mortars, suited tothe different processes of contusion and trituration, and by ml^>- Mortars for contusion are usually made of iron, brass, or bell-metal, of the shape shown in Fig. 70. Contusion is employed for Fig. Mortar and pestle for contusion. powdering and bruising ligneous substances generally, being adaptedto breaking apart their fibres, and, by the violent attrition of the THE PKOCESS OF POWDERING DRUGS. 69 coarser particles with, each other, reducing the whole to a more orless fine powder. Care must be taken to avoid treating any corrosive substance inthe iron mortar, thus allowing it to become rusty; or, if this shouldoccur, it should be carefully washed out with diluted muriatic acid,and scoured with clean sand, to fit it for use. Any adhering mate-rial should be cleaned away immediately after the mortar is out ofuse, as it is then more easily removed than if allowed to remain andharden. The mortar is then always ready for use. In powdering substances by contusion, a small quantity shouldbe introduced into
Size: 1396px × 1789px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjectpharmacy, bookyear185
