Subsequently other formulæ of somewhat different composition passed the test—
| No. 2. | No. 3. | No. 4. | |
| Date of Permit | 16-8-15 | 14-4-16 | 14-4-16 |
| Nitroglycerine | 19·5 | 15 | 15 |
| Collodion cotton | 0·5 | 0·5 | 0·5 |
| Trinitro-toluene } | |||
| Dinitro-toluene } together | 2 | 1·5 | 3 |
| Dinitro-benzene } | |||
| Ammonium nitrate | 42 | 52 | 46 |
| Wood meal | 5·5 | 5·5 | 5·5 |
| Sodium chloride | 30 | 25 | 29·5 |
| Magnesium carbonate | 0·5 | 0·5 | 0·5 |
Limit charge | 24 | 18 | 30 oz. |
| Power (swing of ballistic pendulum) | 2·46 | 2·50 | 2·35” |
Of these only Nos. 3 and 4 are still permitted.
*E.C. POWDER was one of the first smokeless shot-gun powders, and is still one of the most successful. The composition has been varied somewhat from time to time, but it has always been a fibrous bulk powder. The following analyses were given in “Arms and Explosives,” 1917, p. 76—
| No. 1. | No. 2. | No. 3. | |
| Date of Introduction | 1882 | 1890 | 1897 |
| Class | 42-grain | 42-grain | 33-grain |
| Nitrocotton, insoluble | 30·0 | 15·9 | 44·0 |
| ” soluble | 28·2 | 41·0 | 30·4 |
| Metallic nitrates | 37·8 | 38·3 | 14·0 |
| Resin | 2·1 | 2·0 | — |
| Vaseline | — | — | 6·0 |
| Camphor | — | 1·0 | 4·0 |
| Moisture | 1·9 | 1·8 | 1·6 |
The powder is manufactured at Green Street Green, near Dartford in Kent. The name is derived from “Explosives Company.”
ECHO or EKKO is a blasting explosive made at Nitedal in Norway, consisting of ammonium nitrate, nitrocotton, trinitro-toluene, aluminium powder, and sometimes ferro-silicon. It has been used on the Continent for filling hand-grenades.
*ECONOMIC SMOKELESS SPORTING POWDER is a 42-grain bulk powder for shot-guns, made by the E.C. Powder Company.
ECRASITE or EKRASIT is a high explosive used in Austria for filling shell and other military purposes. It is the ammonium salt of trinitro-cresol.
ELECTRONITE.—There have been several explosives of this name, but none of them have been used extensively, and all are dead now. There was a coal-mine explosive formerly on the Permitted List—