Explosives . , that the erosion is mostsevere ; in smaller guns it is comparatively trifling. By properly proportioningthe chamber and the length of the gun. and making the powder of the rightsize and shape, the erosion can be reduced somewhat, but naval guns of largesize require re-lining after they have fired a few hundred full charge - With smokeless powder the erosion mostly consists in washing the surface of the metal smoothly away. With high charges of black powder, which generated temperatures of the same order, the metal was scored into deep rnt-. and this has been ascribed to the m<
Explosives . , that the erosion is mostsevere ; in smaller guns it is comparatively trifling. By properly proportioningthe chamber and the length of the gun. and making the powder of the rightsize and shape, the erosion can be reduced somewhat, but naval guns of largesize require re-lining after they have fired a few hundred full charge - With smokeless powder the erosion mostly consists in washing the surface of the metal smoothly away. With high charges of black powder, which generated temperatures of the same order, the metal was scored into deep rnt-. and this has been ascribed to the m< chanical action of the -olid particles 1 Set 1907, ,,. jii. - Artillery . 634. REQUIREMENTS OF A SLOW-BURNING SMOKELESS POWDER 317 in the products of explosion. With smokeless powder there is some scoring,but not nearly so much. Erosion is most severe, not in the powder chamber, but just in front ofit, where the powder gases rush past between the copper band of the projectile. 20/ 30^ 40/. 507. Per cent. NitroglycerineFig. (53. Nobles Erosion Experiments and the bore of the gun. Further down the bore the wear is much less, asthe pressures are less, the copper bands lit the rifling better, and the projectileis travelling so rapidly, thai (lie escapes of gas have little time to do harm. The inner tubes of guns also occasionally split. This is apparently causedby the alternate heating and cooling of the inner surface of the metal combinedwith the compression to which it is subjected. The result is that the surfacelayer <»f metal is in a state of tension. ^ ainell lias shown that just as nitro-glycerine powders cause more erosionI hau those that only contain nitro-cellulose, so nitro-cellulose powders of highnitration are worse in this respect than those of low nitration, in spite of the 60/, 318 EXPLOSIVES fact thai a smaller charge is Like Vieille he found that the erosionis practically independent of the pressure if it exceed 2000 atmospheres.
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Keywords: ., bookcentury1900, bookdecade1910, bookidexp, booksubjectexplosives
