*INDURITE was a smokeless powder patented by C. E. Munroe in 1893. It was made by incorporating guncotton with nitro-benzene to a hard mass. It was used for a time in the American Navy. Samples made in 1891 were still stable apparently in 1914, but some cases of instability occurred and it was given up.
INGÉLITE is the same in composition as [ANTIGEL DE SÛRETÉ].
*Poudre J.—A French smokeless powder used for shot-guns and revolvers. Its composition is—
| Nitrocotton | 83 |
| Ammonium bichromate | 14 |
| Potassium bichromate | 3 |
| Moisture | about 3 |
It is incorporated with the aid of ether-alcohol and pressed into strips, which are cut into cubes and then converted into grains of irregular shape. The fine siftings are used for revolver and practice ammunition.
JUDSON POWDER.—A mild blasting explosive used in America. It is a sort of crude gunpowder coated with nitroglycerine to increase the violence of the explosion. The percentage of nitroglycerine may vary from 5 to 20, but is generally near the lower limit. Judson Powder R.R.P. has the composition—
| Nitroglycerine | 5 | Nitroglycerine | 5 |
| Sodium nitrate | 64 | or Sulphur, coal and resin | 35 |
| Sulphur | 16 | Sodium nitrate | 60 |
| Cannel coal | 15 |
The sodium nitrate is mixed with the combustibles and the mixture is heated beyond the melting-point of the sulphur and resin. The slightly porous mass thus formed is then coated with nitroglycerine. The explosive is fired with a priming cartridge of dynamite. The following four grades are made by the Du Pont Co.—
| FFF | 20 % nitroglycerine |
| FF | 15 ” |
| F | 10 ” |
| RRP | 5 ” |
KANITE A is an American coal-mine explosive on the Permissible List. It is an ammonium nitrate explosive.