LIST OF EXPLOSIVES. 369 



chromates, permanganates of organic alkalis ; on the other hand, 

 nitrous ethers, perchloric ethers, etc. 



(6) Here we may also add the explosive derivatives of 

 hydrogen peroxide ; ethyl, acetyl, etc., peroxides. 



(7) The hydrocarbon derivatives of mineral oxides which can 

 be easily reduced, especially the salts of silver and mercury 

 oxides, such as silver oxalate, mercury oxycyanide, etc. 



(8) The derivatives of the hydrocarbons and other bodies 

 characterised by an excess of energy with relation to their 

 elements, such as metallic acetylides, etc. 



5. Fifth group. Mixtures of definite explosive compounds with 

 inert bodies. Each of the preceding compounds, whether solid 

 or liquid, can be mixed with inert bodies, destined to attenuate 

 the effects. Dynamite, properly so called, with a silica or 

 alumina base, wet gun-cotton, or soaked with paraffin, nitro- 

 glycerin dissolved in methylic alcohol, camphorated gun-cotton 

 and dynamite, etc., constitute such mixtures. 



6. Sixth group. Mixtures formed ~by an explosive oxidisaUe 

 compound and a non-explosive oxidising body destined to complete 

 the combustion of the former. Such are 



(1) Gun-cotton mixed with potassium or ammonium nitrate 

 potassium picrate mixed with potassium chlorate or nitrate, etc 



(2) Also the mixtures of nitric acid with nitro compounds, 

 such as dinitrobenzene, the nitro toluenes, picric acid (trinitro- 

 phenol), etc., generally mixed in the form of paste. 



(3) The mixtures of nitric peroxide and nitro compounds are 

 also classed here. 



7. Seventh group. Mixtures with an explosive oxidising base. 



(1) The mixtures formed by an explosive body containing 

 an excess of oxygen (nitroglycerin, nitromannite) and an 

 oxidisable body such as carbon dynamite. 



(2) Analogous bodies, in which the oxidising and oxidisable 

 bodies are both explosive, such as blasting gelatin formed by 

 the association of nitrocellulose and nitroglycerin, etc. 



8. Eighth group. Mixtures formed by oxidisable and oxidising 

 bodies, solid or liquid, neither of these being explosive separately. 

 This group comprises 



(1) Black powder formed by the association of sulphur and 

 carbon with potassium nitrate and constituting the varieties 

 designated as service, sporting, and blasting powder, etc. 



(2) The various powders formed by the association of hydro- 

 carbon compounds, charcoal, coal, wood, sawdust, various kinds 

 of cellulose, starch, sugar, ferrocyanide, or by the association of 

 sulphur and metals with potassium, sodium, barium, strontium, 

 lead, etc., nitrates. 



(3) The liquid or pasty mixtures formed by the association of 

 liquid nitric acid either with a combustible liquid or with a solid 

 substance on which it does not exercise an instantaneous action. 



2B 



