Of the above, IV. was found only to be safe in very small charges in the presence of fire-damp. No. V. has a “charge limite” of 700 grammes. =DYNAMMON.=--The coal-mine explosive provided by the Austrian State monopoly-- Dynammon. Wetter-Dynammon. Ammonium nitrate 87-88 94 Potassium nitrate -- 2 Red charcoal 12-13 4 Density 0·9 0·85 =DYNOBEL.=--A coal-mine explosive made by Nobels. The first formula to pass the Rotherham Test contained potassium perchlorate-- _Date of Permit_ 1-9-13 Nitroglycerine 33 Collodion cotton 0·7 Potassium perchlorate 27 Wood meal 10·3 Ammonium oxalate 29 Limit charge 22 oz. Power (swing of ballistic pendulum) 2·61” 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.”