But to pass the Rotherham Test it was necessary to add alkali chlorides. There were two formulæ formerly on the Permitted List—
| No. 1. | No. 2. | |
| Date of Permit | 22-6-14 | 28-1-15 |
| Ammonium nitrate | 65·5 | 64 |
| Trinitro-toluene | 15 | 15 |
| Sodium chloride | 19·5 | — |
| Potassium chloride | — | 21 |
Limit charge | 12 | 20 oz. |
| Power (swing of ballistic pendulum) | 2·92 | 2·63” |
The permits have been repealed.
*N.C.T. is the name given in the British service to the Nitro-Cellulose Tubular smokeless powder, made in the same way as the American service powder. It consists of nitro-cellulose completely soluble in ether-alcohol, but of comparatively high nitration. It is gelatinised with ether-alcohol and pressed into cords with either one or seven perforations running down them length-ways. These are cut into short cylinders and dried. The powder contains a little diphenylamine as a stabiliser.
N.E. See [New Explosives Company’s Smokeless Powder].
NEGRO POWDER.—A coal-mine explosive of the [Grisounite] class made by Roburite and Ammonal, Ltd. The composition, which was on the old Permitted List, was—
| Ammonium nitrate | 88 |
| Trinitro-toluene | 10 |
| Graphite | 2 |
| and a small quantity of colouring matter. | |
To enable it to pass the Rotherham Test, sodium chloride has been added, and Negro Powder No. 2 is now on the Permitted List—
| Date of Permit | 25-11-13 |
| Ammonium nitrate | 57 |
| Trinitro-toluene | 15 |
| Graphite | 0·7 |
| Sodium chloride | 27·3 |
| Colouring matter | small quantity |
Limit charge | 20 oz. |
| Power (swing of ballistic pendulum) | 2·21” |
NEONAL.—A coal-mine explosive made by the New Explosives Company. Two formulæ were at one time on the Permitted List—