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100 per cent after-corrosion proceeds alkaline ammonium oleate anticorrosive approximately 50 aqueous solution barium nitrate barrel black powder bore surface bullet Bureau of Mines calcium chloride calcium nitrate ceased to corrode cent humidity chlorate cited compounds corrosion of iron corrosion under oil corrosive acid corrosive fouling corrosive residue cupro-nickel fouling dew point distilled water emulsifiable oil emulsion exposure firearms FIRING TESTS fissures Gruppe Herstellung high humidities humidity of approximately humidor iron and steel June 16 June 20 Klasse 78e liquid film mercury fulminate metal fouling mixture nitrocellulose nitrogen nonaqueous oil films oleate plus water Ordnance Department oxygen PAPER 188 PLATE patented percussion potassium chloride present service cartridge prevent after-corrosion primer Process for preparing properties remove the corrosive saturated solution smokeless powder soap sodium carbonate sodium carbonate solution sodium chloride solvent steel surfaces sulphur swabbed with oil sweating Table temperature theory tion tool wounds Trinitrotoluene water vapor
Page ii - Mines, in carrying out one of the provisions of its organic act — to disseminate information concerning investigations made — prints a limited free edition of each of its publications. When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines.
Page vii - ... scraped off (under the abrading action of irregularities or grit in the bore). Powder fouling, because of its acid reaction, is highly corrosive; that is, it will induce rust and must be removed. Metal fouling of itself is inactive, but may cover powder fouling and prevent the action of cleaning agents until removed, and when accumulated in noticeable quantities it reduces the accuracy of the rifle.
Page v - Department 1 of the Army says that probably more rifles are ruined by improper preparation for storage than by any other cause ; and the problem, though primarily military, touches the interest of every owner of a firearm. The importance of this study is not, however, limited to the users of firearms. The fundamental problem proved to be corrosion under oil films; this differentiates after-corrosion sharply from the ordinary corrosion of clean iron and steel surfaces. It...
Page 13 - Corrosion tests of rifles fouled with service cartridges, then cleaned 'with water alone, and with soap and water, showed that such treatment completely prevented after-corrosion.
Page vii - Marshall,8 an authority on explosives, when he says " — black powder * * * has been able to hold its own in certain fields in 'consequence of its advantages : * * * and the noncorrosive nature of the residue which it leaves in the gun.