Part 24

Including not more than 2 per cent. of magnesium carbonate.

=MONOBEL= is a coal-mine explosive made by Nobel’s Explosives Co. There are three formulæ which have passed the Rotherham Test, but A1 is no longer on the Permitted List--

Monobel A1 A2 No. 1. Monobel. Monobel. Date of Permit 10-2-14 13-5-14 15-1-15

Ammonium nitrate 68 60 59 Nitroglycerine 8·5 10 10 Wood meal 8·5 10 10 Sodium chloride 15 -- -- Potassium chloride -- 20 20 Magnesium carbonate -- -- 1

Limit charge 10 28 22 oz. Power (swing of ballistic pendulum) 2·81 2·78 2·44”

There is also Quarry Monobel which is not permitted for use in dangerous coal mines, and presumably contains no alkali chloride.

See also Viking Powder and Victor Powder.

=MONOBEL, NOS. 1= to =7= are on the American Permissible List. Of these, Nos. 4 and 5 are low-freezing explosives, containing a small percentage of nitro-toluene or similar substance; Nos. 3 and 5 are less violent than the others.

=MONOBEL POWDER= was the predecessor of the above and was on the old Permitted List. It is now no longer “permitted.”

Ammonium nitrate 80 Nitroglycerine 10 Wood meal 10

=*MULLERITE.=--A shot-gun powder made by the Muller Co. in Belgium. It is a gelatinised dense powder in the form of green leaflets, and the charge for a 12-bore cartridge was 33 grains. It contains no inorganic salts.

=EXPLOSIFS N.= See Favier Explosives.

=NAPHTHALIT.=--A German chlorate explosive introduced during the War. It contains not more than 80 per cent. of potassium chlorate, and aromatic hydrocarbons, such as naphthalene, and not more than 12 per cent. of nitro-hydrocarbons, but no trinitro-compounds; also paraffins, fatty oils, flour or other organic substance. It may contain also alkali chlorides, and not more than 4 per cent. of blasting gelatine.

The prefixes Gesteins- and Wetter- are applied according as the explosive is intended for rock or coal mines.

Grisou-=NAPHTALITE=. See =FAVIER= Explosives.

=NATIONALITE.=--A coal-mine explosive of the Grisounite class made by the National Explosives Co., Ltd. The composition, which was on the old Permitted List, was--

Ammonium nitrate 92 Di- and Trinitro-toluene 8

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--