. Journal. beforeeach reading. At the end of the test, the decomposition-vessel is removed from the bath, allowed to cool, cleanedand weighed. The pressures observed are reduced to thecorresponding ones for I grm. of substance. The following results were obtained with : (a) a sampleof guncottou (12-9 per cent, of nitrogen; solubility inether-alcohol. 8 per cent.): (6) a sample of collodion-cotton (1 -J? 4 per cent, of nitrogen; solubility in ether-alcohol, 98 per cent.). *w Guncotton. Collodion Cotton. Time. U1IDS. Pressure. Increase of Pressure. Increase ofPressure. mm. mm. 0 0 19 0 15 15 19
. Journal. beforeeach reading. At the end of the test, the decomposition-vessel is removed from the bath, allowed to cool, cleanedand weighed. The pressures observed are reduced to thecorresponding ones for I grm. of substance. The following results were obtained with : (a) a sampleof guncottou (12-9 per cent, of nitrogen; solubility inether-alcohol. 8 per cent.): (6) a sample of collodion-cotton (1 -J? 4 per cent, of nitrogen; solubility in ether-alcohol, 98 per cent.). *w Guncotton. Collodion Cotton. Time. U1IDS. Pressure. Increase of Pressure. Increase ofPressure. mm. mm. 0 0 19 0 15 15 19 22 15 16 30 41 25 31 20 45 66 29 51 H 60 95 75 JOURNAL OF Tl IV OF CHEMICAL INDUSTRY. [April 15,1 The i lined by the authors method in one hour and well with those yielded by Berg nm andJunks ptocora in 7—8 hours. :i example of the application of the method tof the nmnufacturi- the anthor examined the influence of washing at the boiling tempera-ture an Ie shown in the followingcurve-diagram. S/a fit/ify. after / Washings. After the fifth washing in the boiling vessel, thestability of the product had attained the desiredstandard. The process of beating the gun-cotton in ahollander is next referred to, and the author states thatthe disintegration has a markedly favourable influence-on the stability of the explosive, quite apart from itsaction in promoting the washing. In this connectionit is pointed out that the specimen of gun-cotton whichafter five washings behaved satisfactorily with regard tostability, was tested after being ground ; when tested inthe unground condition, excessive pressure was developedin the first minute, and after a short time, the gun-cottonexploded. The relation between the state of divisionof the material and its stability was also clearly shownby cutting a specimen of dried, unground gun-cottonwith scissors successively into smaller and smaller pieces,and testing it from time to time. It is recommended thatall samples of gun-cotton before being tested
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
