=*COOPPAL’S POWDER.=--A Belgian smokeless shot-gun powder. Formerly it was much the same as Schultze Powder, consisting of nitrolignin carefully purified, and mixed with nitrates with or without the addition of starch. The following analyses were published in “Arms and Explosives” for July 1917-- No. 1. No. 2. 1892. 1900. Fibrous Gelatinised 42-grain 30-grain bulk. dense. Nitrocellulose, insoluble 13·0 71·1 ” soluble 60·5 20·1 Metallic nitrates 21·3 2·0 Shellac 3·2 -- Nitro-hydrocarbons -- 5·5 Moisture 2·0 1·3 =CORDITE= is the principal smokeless powder of the British Services. It was originally adopted in 1888, and is made by mixing nitroglycerine with guncotton and mineral jelly (a sort of crude vaseline), and incorporating them together with the aid of acetone, which gelatinises the guncotton. In consequence of the severe erosion of the guns experienced during the South African War the proportions were altered, some of the nitroglycerine being replaced by guncotton. The propellant thus “modified” is called Cordite M.D., whereas that of the original composition is Cordite Mk.I. Both are still in use, especially M.D.-- Mk. I. M.D. Guncotton 37 65 Nitroglycerine 58 30 Mineral jelly 5 5 During the great European War a further variety was introduced to extend the basis of supply of solvents. This is called Cordite R.D.B. (Research Department B), and contains a nitrocotton of comparatively low nitration that can be gelatinised by means of a mixture of ether and alcohol-- Nitrocotton 52 Nitroglycerine 42 Mineral jelly 6 It is designed to give about the same ballistics as Cordite M.D. A further letter is sometimes added to show the form of the powder. Thus Cordite M.D.T. is M.D. pressed into tubes; S. stands for strip. The size is indicated by a numeral, which shows the diameter in hundredths of an inch of the die through which it has been pressed. In the case of tubular powder both the external and internal diameters are given approximately: _e. g._ Cordite M.D.T. 5-2. Poudre blanche =CORNIL=.--A Belgian coal-mine explosive containing ammonium nitrate, potassium or sodium nitrate, dinitro-naphthalene and lead chromate, with or without the addition of ammonium chloride. =CORNISH POWDER.=--A coal-mine explosive which passed the Woolwich Test and was formerly on the Permitted List, made by the National Explosives Co., Ltd.-- Nitroglycerine 55 Nitrocotton 3 Potassium nitrate 18 Wood meal 7 Magnesium sulphate 17