. American chemical journal . r, be in opposition to their own interest, since oils of highflash and excellent quality are already in the market and areextensively used. The experiments described above show conclusively that an oilheated above its flashing point is dangerous, whether that point be 362 Newbury. high or low. There can, therefore, be no doubt that in using kero-sene of ordinary quality in the powerfully heating lamps which arenow common, we are dependent for our safety upon the accurateconstruction of the burners, which render it difficult for the explo-sive vapors in the lamp to
. American chemical journal . r, be in opposition to their own interest, since oils of highflash and excellent quality are already in the market and areextensively used. The experiments described above show conclusively that an oilheated above its flashing point is dangerous, whether that point be 362 Newbury. high or low. There can, therefore, be no doubt that in using kero-sene of ordinary quality in the powerfully heating lamps which arenow common, we are dependent for our safety upon the accurateconstruction of the burners, which render it difficult for the explo-sive vapors in the lamp to become ignited. An oil which flashesbelow 120° F. is not safe to use in these lamps, and with oils ofordinary grade the conditions of explosion are constantly present. IX.—APPARATUS FOR FRACTIONAL DISTILLATIONIN VACUUM. By Spencer E. Newbury. The subject of distillation under reduced pressure has beenthoroughly discussed by Anschiitz, and the apparatus recom-mended in that authors pamphlet certainly appears to leave litde. to be desired in respect of convenience or efficiency. The arrange-ment shown in the accompanying figure has, however, the advan-tage that none of its parts require to be specially constructed, andthe whole may easily be put together from apparatus to be foundin almost any laboratory. Ueber die Destination unter vermindertem Druck, Bonn, 1887. Decomposition of Acetone with Bleaching Powder. 363 A distilling bulb, A, is provided with a double-bored rubberstopper, through one aperture of which passes a thermometer, andthrough the other the tube of an ordinary separating funnel, drawnout at its lower end to a capillary tube which reaches nearly to thebottom of the flask. The outlet tube of the bulb is connected witha condenser, as shown in the sketch. The inner tube of the con-denser is bent down at its lower end and terminates in a secondseparating funnel, the tube of which passes into the receiver D;from the latter a small bent tube E serves to connect the
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbalti, bookyear1879
