. The Pharmaceutical era. erimentsproved that it was possible to separate 5 cc. of air (nor-mal pressure and temperature) into oxygen and nitrogenin one hour per horse-power AN APP-\R-\TITS FOR GENERATING LOWTEJIPERATURES.—J. Lewis (Chem. and Drug.) hasdevised a very convenient form ofapparatus adapted for producing alow temperature by means of therapid evaporation of ether, ammonia,etc. A wide-mouthed jar is placedin a container, the space around thejar being filled with oakum or anypoor conductor of heat; the rubberstopper of the jar contains one largeand two small perforations. T
. The Pharmaceutical era. erimentsproved that it was possible to separate 5 cc. of air (nor-mal pressure and temperature) into oxygen and nitrogenin one hour per horse-power AN APP-\R-\TITS FOR GENERATING LOWTEJIPERATURES.—J. Lewis (Chem. and Drug.) hasdevised a very convenient form ofapparatus adapted for producing alow temperature by means of therapid evaporation of ether, ammonia,etc. A wide-mouthed jar is placedin a container, the space around thejar being filled with oakum or anypoor conductor of heat; the rubberstopper of the jar contains one largeand two small perforations. Throughone perforation a thistle tube passes,extending nearly to the bottom ofthe jar, which is filled about two-thirds full of ether or concentratedammonia; a second short tube passesout from above the surface of thefluid and is attached to a waterpump. In the larger opening a largetest tube is placed, which serves asa mantle tor another tube ofslightly smaller diameter, which is placed inside and con-tains the fluid which is to be cooled or frozen. The airspace between these two tubes is partly filled with mer-cury (as shown by the heavy line in the figure), whichserves as a
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
