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Examples
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We shall only describe the manufacture of the two forms known as soluble and insoluble, and shall refer to them under their better known names of gun-cotton and collodion-cotton.
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Air-dried collodion-cotton, long staple "Red Island | cotton," 3 years old | 186-191
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Theoretically 100 parts of cotton by weight should produce 218.4 parts of gun-cotton, but in practice the yield is a good deal less, both in the case of gun-cotton or collodion-cotton.
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(The production of the penta-nitro-cellulose is aimed at if the collodion-cotton is for use as an explosive.)
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In the manufacture of smokeless powders from nitro-cellulose, nitro-lignine, &c., the various substances are mixed with the gun-cotton or collodion-cotton before granulating.
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Berthelot, [A] the heat of formation of collodion-cotton is 696 cals. for
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It is stated to be an odourless, unfreezable oil, less sensitive to percussion, friction, and increase of temperature, and to possess a greater solvent power for collodion-cotton than ordinary nitro-glycerine.
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Analyses of collodion-cotton, 81. gelatine dynamites, 123.
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It is probable that it chiefly consists, however, of the next highest nitrate to gun-cotton, as the theoretical percentage of nitrogen for this body,. the penta-nitrate, is 12.75 per cent., and analyses of commercial collodion-cotton, entirely soluble in ether-alcohol, often give as high a percentage as 12.6.
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~ -- This explosive consists of gun-cotton (with a little collodion-cotton in it as impurity), nitro-glycerine, and vaseline -- the proportions being given as 30 per cent. nitro-glycerine, 65 per cent. gun - cotton, and 5 per cent. vaseline.
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