PERDORFIT contains not more than 52 per cent. of potassium perchlorate, sodium and ammonium nitrates, not more than 29 per cent. of trinitro-toluene and vegetable meal or gums.
DRAGONITE.—A coal-mine explosive made by Curtis’s and Harvey, formerly on the Permitted List—
| Nitroglycerine | 35·5 |
| Nitrocotton | 2·5 |
| Potassium nitrate | 44·5 |
| Vaseline | 5·5 |
| Wood meal and charcoal | 12 |
DREADNOUGHT POWDER.—A coal-mine explosive made by Roburite and Ammonal, Ltd., for a time on the Permitted List—
| Date of Permit | 1-9-13 |
| Ammonium nitrate | 75·4 |
| Trinitro-toluene | 4 |
| Ammonium chloride | 5 |
| Sodium chloride | 15·5 |
| Red oil | 0·1 |
Limit charge | 32 oz. |
| Power (swing of ballistic pendulum) | 2·05” |
There is also Quarry Dreadnought Powder, which is not a permitted explosive.
DUNNITE.—A high explosive used by the United States for filling shell. It is stated to give dangerous compounds with iron, so apparently is a compound of picric acid.
DU PONT PERMISSIBLE.—An American coal-mine explosive. The following is on the British Permitted List—
| No. 1. | |
| Date of Permit | 26-4-16 |
| Nitroglycerine | 9·5 |
| Ammonium nitrate | 67·5 |
| Wood pulp | 8 |
| Sodium chloride | 15 |
Limit charge | 18 oz. |
| Power (swing of ballistic pendulum) | 2·82” |
*DU PONT SMOKELESS POWDER.—An American shot-gun powder of the fibrous 36-grain bulk type—