No. 4 _Date of Permit_ 13-5-14 Ammonium nitrate 61 Trinitro-toluene 16 Sodium chloride 23 Limit charge 18 oz. Power (swing of ballistic pendulum) 2·86” =ROCKITE= is an explosive made by Curtis’s and Harvey for quarry work, etc. =ROMPERIT.=--A German blasting explosive containing ammonium nitrate, potassium nitrate, trinitro-toluene, flour and resin. It may also contain up to 4 per cent. of blasting gelatine. Wetter-Romperit contains also sodium chloride, ammonium chloride or magnesite, and is used in coal mines. Gelatine-Romperit contains gelatinised nitroglycerine, glycerine, potato meal, etc., and nitrates, and may also contain aromatic nitro-compounds and alkali nitrates. Romperit G, which has been introduced recently, contains up to 10 per cent. of potassium perchlorate, and is similar to Astralit V. =ROSLIN GIANT BLASTING POWDER= is a perchlorate explosive made by Curtis’s and Harvey. =*ROTTWEIL SMOKELESS POWDERS.=--These were pushed energetically in England in 1913. They comprised a gelatinised rifle powder, and a 37-grain gelatinised dense shot-gun powder. Analyses were given in “Arms and Explosives,” 1917, p. 90-- Shot-gun. Rifle. Nitrocellulose, insoluble 72·3 72·8 ” soluble 24·5 25·0 Metallic nitrates 0·7 -- Camphor and diphenylamine 1·0 1·0 Moisture 1·5 1·2 =*RUBY POWDER.=--- A 42-grain bulk smokeless powder, for shot-guns, introduced in 1899 by Curtis’s and Harvey. The following analysis was given in “Arms and Explosives,” 1917-- Nitrocellulose, insoluble 46·6 ” soluble 4·0 Metallic nitrates 34·0 Nitro-compound 8·2 Starch 5·5 Moisture 1·7 It is an inexpensive powder made without solvents. =RUSSELITE.=--A coal-mine explosive which was made by the Forcite Co. in Belgium. It was on the old British Permitted List-- Nitroglycerine 40·5 Collodion cotton 2·3 Potassium nitrate 24·5 Trinitro-toluene 5·5 Wood meal 4 Ammonium oxalate 23 Calcium carbonate 0·2 *Poudre =S= is a shot-gun powder made by the French Government. It consists of-- Guncotton 37 Soluble nitrocotton 28 Potassium nitrate 6 Barium nitrate 29 Moisture 2 The ingredients are incorporated together under light edge runners, dried and partially gelatinised with 35 per cent. of ether-alcohol. The dough, which is not very coherent, is formed into grains by simply passing it through a sieve. The grains are dried, sifted, hardened if necessary with ether-alcohol, and again dried and sifted.