. A treatise on pharmacy .. . drops as fast as it accumu-lates. Sometimes the receiver is refrigerated, and not the beak of theretort, and this is perhaps the most common arrangement for retort Fig. 182. distillation. It is shown in , which represents a plain re-tort, a common flask adjusted to itas a receiver, and set into a basin,which, by being kept filled withwater, would also facilitate therefrigeration of the flask by wetcloths laid upon it. Where thisarrangement is adopted, care shouldbe taken not to secure the beak ofthe retort tightly into the neck ofthe receiver, in which case
. A treatise on pharmacy .. . drops as fast as it accumu-lates. Sometimes the receiver is refrigerated, and not the beak of theretort, and this is perhaps the most common arrangement for retort Fig. 182. distillation. It is shown in , which represents a plain re-tort, a common flask adjusted to itas a receiver, and set into a basin,which, by being kept filled withwater, would also facilitate therefrigeration of the flask by wetcloths laid upon it. Where thisarrangement is adopted, care shouldbe taken not to secure the beak ofthe retort tightly into the neck ofthe receiver, in which case theexpansion of the heated air andvapors, on commencing the opera-tion, would lead to a rupture ofsome part of the apparatus. The plain retort is almost super-seded of late years by the tubulated, which has the advantage ofallowing the more ready introduction of substances to be distilled, andby loosening the stopper, the prevention of accidents from the toogreat tension of the vapor, and from the too sudden refrigeration of. Distillation with plain retort and receiver. 818 CHEMICAL PROCESSES. the retort, which would cause some condensed distillate to flow back,endangering the safety of the retort. Fig. 184 represents a well-Fig. 183. known form of condensing appa-ratus which is constructed on avariety of patterns, and of dif-ferent materials. That repre-sented, Fig. 184, is one I havehad in use for several years, andprefer on several accounts to themore expensive and complicatedkinds. It consists of a tin tube 18inches long and 2 J inches in di-ameter, and having the ends reduced to 1% inch to suit the largest Fig. 184.
Size: 1522px × 1642px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectpharmacy, bookyear186
