244 



TABLES 265-268. 

 TABLE 265. - Additional Data on Explosives. 



Shattering power of explosive = vol. gas per g X cals./g X Vd X density where Vd is the velocity of detonation. 



Trinitrotoluene: Vd = 7000 m/sec. Shattering effect = .87 picric acid. 



Amatol (Ammonium nitrate + trinitrotoluene, TNT): Vd = 4500 m/sec. 



Ammonal (Ammonium nitrate, TNT, Al): 1578 cal/g; 682 cc gas; Vd = 4000 m/sec. 



Sabulite (Ammonium nitrate, 78, TNT 8, Ca silicide 14): about same as ammonal. 



TABLE 266. Ignition Temperatures Gaseous Mixtures. 



Ignition temperature taken as temperature necessary for hot body immersed in gas to cause ignition; slow com- 

 bination may take place at lower temperatures. McDavid, J. Ch. Soc. Trans, in, 1003, 1917. Gases were mixed 

 with air. Practically same temperatures as with Cfe (Dixon, Conrad, loc. cit. 95, 1909). 



TABLE 267. Time of Heating for Explosive Decomposition. 



n, failure to explode in twenty minutes. * The decomposition of nitrocellulose in celluloid commences at about 

 100 C; above that the heat of decomposition may raise the mass to the ignition point if loss of heat is prevented. 

 Above 170, decomposition occurs with explosive violence as with nitrocellulose. Rate of combustion is 5 to 10 times 

 that of poplar, pine, or paper of the same size and conditions. 



t Measured by contact with porcelain tube of given temperature. Average. 



J Measured by contact with molten lead. Average. 



Taken from Technologic Paper of Bureau of Standards, No. 98, 1917. 



TABLE 268. Flame Temperatures. 



Measures made with optical pyrometer by F6ry, J. de Phys. (4) 6, 1907. 



SMITHSONIAN TABLES. 



