American journal of pharmacy . sive degree of heat, is gene-rally acknowledged to furnish products far superior to thoseotherwise obtained. To secure this desideratum by the apparatus at present in useis attended, in addition to the large original outlay, with constantexpense; as a consequence it is available only to the extensivemanufacturer. It is the object of this paper to call attention to a new form ofvacuum apparatus, one which, it is believed, will recommend it- 9 130 AN AUTOMATIC VACCUUM APPARATUS. self for its simplicity, its comparatively small cost, its automaticaction and its inex
American journal of pharmacy . sive degree of heat, is gene-rally acknowledged to furnish products far superior to thoseotherwise obtained. To secure this desideratum by the apparatus at present in useis attended, in addition to the large original outlay, with constantexpense; as a consequence it is available only to the extensivemanufacturer. It is the object of this paper to call attention to a new form ofvacuum apparatus, one which, it is believed, will recommend it- 9 130 AN AUTOMATIC VACCUUM APPARATUS. self for its simplicity, its comparatively small cost, its automaticaction and its inexpensive operation. This plan was devised by the writer several years since, but itis proper to remark that it has never been put into actual prac-tice. The peculiarity of the method consists in the means employedfor effecting the exhaustion; it is founded upon the well knownprinciple of the Torricellian vacuum. Substitute for the baro-metric tube of thirty-four inches, one of water of as many feet, scale:of inches lfoot Rffiet. Dimensions in inches. Capa iry in pa! onfl. 18X00 ti6-09 7-5X13 2-48 8X13-75 289 18X28 Diameter 11 2-89 A—Vacuum chamber B—Reservoir G—Receiver Z> - Condenser • • - E—Still, with an eight inch opening F— Still head. G—Water-bath, a—Vacuum guage; a bent glass tube communicating with thevacuum chamber. The closed limb is completely filled with mercury, which also slightly ascendsinto the other limb. Behind the tube is a scale of inches, b—Hydrant pipe, c—stopcock, actu-ated by the float, d—Pipe allowing the egress of the air from the vacuum chamber, and also theescape of surplus water into the reservoir, e— Stopcock, closed by a spring attached to the rod. ;;./—Spring, g—Rod connected with the float, h—Float, i—Pipe issuing from the bottom of thevacuum chamber. It is provided with a stopcock, (j) and is thirty-six feet long; its lower ex-tremity being turned upwards and surmounted by the funnel, k. J—Stopcock. I;—Fu
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Keywords: ., bookcentury1800, bookdecade182, booksubjectpharmacy, bookyear1829
