WEAR IN BIG GUNS
KfcMOVING COPPER FROM THi2 BORE. The wear of large guns has a most important influence on the coat of the war, not only on account of the expense of effecting repairs, but because such wear leads tp inaccuracy of fire, and so increasos the aiuount of ammunition expended to attain a definite objective, writes Major T. G. Xulloch in Arms and Explosives. In short, if a few thousandtin of an inch of steel at the commencement of the riffling of guns, etc-, could be prevented from wearing away in so short a time as at present, the reduction in the cost of the war, so far as guns, ammunition, transport, etc., are concerned, is almost incalculable. Major Tulloch differentiates between the damage to the bore near the breech end—damage for which he retains the usuai term "corrosion"—and that near the muzzle, which 'lie prefers to call "erosion" as it is a purely mechanical effect. Tlu< causes which produce the first -named class of damage arc complex, and include the effects of temperature, the form and dimensions of the powder chamber, the chemical and physical qualities of the powder used, the weight of charge and vapidity of fire, the ga3, escape past the projectile, and the composition and physical properties of the steel used for the inner tubes of the gnft. As regards the physical properties of life ntcei vised for the inner lube, Major Tulloch considers that the heat treatment should bo subject to the analysis of the steel and the forging effect, and lie urges the necessity of obtaining more effective forging of the portion or" the tube forming the bore, and suggests certain methods of securing this result. ■Willi legard to the erosion near the muzzle dim to frictional wear and metallie fouling, It is pointed out that to secure good shooting' it is desirably to prevent such fouling by all practicable meana, such ?.r. slightly bell-mouthing the bore, and, aa indicative of the importance of this matter, he states that by electrolytic methods over 151b weight of I'opne'r have been removed from the bore of an Sin gun after firing just over 100 rounds.
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Taranaki Daily News, 14 February 1918, Page 3
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361WEAR IN BIG GUNS Taranaki Daily News, 14 February 1918, Page 3
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