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标题: compounds the thinner [打印本页]

作者: yainimuly 时间: 2013-7-31 14:42
标题: compounds the thinner

h which no such difficulty will be encountered, and with which, as will soon be seen, a much higher degree of precision may be attained. ANALYSIS OF THE DATA FOB EXPLOSIVE COMPOUNDS. At the beginning of these investigations the impossibility of fully utilizing the theoretical potential energy of explosive mixtures when fired under water, and their constant liability to deterioration from accidental wetting, were both [http://www.nikeairmaxeuropa.com/ cheap nike air max shoes] appreciated; [http://www.nikeairmaxeuropa.com/ cheap nike air max shoes] [http://www.nikeairmaxeuropa.com/ cheap nike air max shoes] and it was, therefore, confidently expected that some variety of explosive compound would prove superior to any of them for use in submarine mining. To make a judicious selection from this class of explosives, a systematic [http://www.nikeairmaxeuropa.com/ nike air max for sale] course of comparative measurements under water was undertaken. In such trials the condition of submergence is essential, and its converse is equally true, viz, that the conclusions reached as to the relative strength of the different varieties Cheap Nike Air Max Sale are applicable only to sub-aqueous explosions, and throw little light on their merits for ordinary mining or rock blasting; in other words, the relative value of different explosives for practical use depends as much upon the nature of the resistance to be overcome as upon their chemical composition. Supplies of the Abel compressed gun-cotton, now adopted in the English torpedo service, and also of the new granulated form, were imported from Stowmarket; samples of various nitro-glycerine compounds in use in this country were obtained, and, to make the list complete, a small supply of picrate powder was added. After extended trials it became evident that dynamite No. 1, consisting of 75 per cent, of nitro-glycerine absorbed by 25 per cent, of kieselguhr, was decidedly the best for [http://www.fitflopsg-singapore.com/ fitflop sale] our objects. Experiments with this explosive were then multiplied until the data needful to fully develop the laws which govern its action when exploded under water were secured. For this reason, and because it is a good Burberry Outlet type of the general class of explosive compounds, it will be considered first. Dynamite (or Giant owder) Ho. 1.—In planning these experiments the effect of motion in the body receiving the shock was only partially appreciated, but as they were extended it became evident that rigidity was essential to determinate results. In the present discussion, therefore, all data in which this condition was not absolutely secured will be left for future consideration. In like manner it was soon discovered, that with explosive compounds the thinner and weaker the case the greater the energy registered upon the leads. Hence, shots fired in wooden boxes will be neglected for theffice:office" />

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