The figures in column headed "Co-efficient of Potential Energy" serve as a measure of comparison of the power of the explosives, and are the products of the number of calories by the volume of gas, the last three figures being suppressed in order to simplify the results. The amounts of water found were calculated for comparison as volumes of H_{2}O gas at 0 deg. and 760 mm. E.C. powder consists principally of nitro-cellulose mixed with barium nitrate and a small proportion of camphor. S.S. of nitro-lignine mixed with barium nitrate and nitro-benzene. Troisdorf powder is gelatinised nitro-cellulose; rifleite gelatinised nitro-cellulose and nitro-benzene. Cordite contains 58 per cent. nitro-glycerine, 37 per cent. gun-cotton, and 5 per cent. vaseline. Ballistite (Italian) consists of equal parts nitro-cellulose and nitro- glycerine, and 1/2 per cent. of aniline. The German contains a higher percentage of nitro-cellulose. TABLE SHOWING THE HEAT DEVELOPED BY EXPLOSIVES CONTAINING NITRO-GLYCERINE AND NITRO-CELLULOSE IN DIFFERENT PROPORTIONS. ______________________________________________________________________ Composition of Explosives. | Calories per cent. _____________________________________________|________________________ Nitro-cellulose | | (N = 13.3 per cent.). | Nitro-glycerine. | | | 100 per cent. dry pulp | 0 | 1061 100 " gelatinised | 0 | 922 90 " | 10 per cent. | 1044 80 " | 20 " | 1159 70 " | 30 " | 1267 60 " | 40 " | 1347 50 " | 50 " | 1410 40 " | 60 " | 1467 0 " | 100 " | 1652 __________________________|__________________|________________________ | | Nitro-cellulose | | (N=12.24 per cent.) | Nitro-glycerine. | | | 80 per cent. | 20 per cent. | 1062 60 " | 40 " | 1288 50 " | 50 " | 1349 40 " | 60 " | 1405 | | __________________________|__________________|________________________| Nitro-cellulose | | (N = 13.3 per cent.). | Nitro-glycerine. | Vaseline. | | 55 per cent. | 40 per cent. | 5 per cent. 1134 35 " | 60 " | 5 " 1280 __________________________|__________________|________________________