THE ARTIFICIAL PRODUCTION OF DIAMOND. 101 



EXPERIMENT. RESULT. 



Graphite, naphthalene, and fulminate ........... Nil. 



Through carbon crucible, containing white hot highly carburized iron . Nil. 



Graphite, saltpetre, and fulminate ............. Nil. 



Iron, caps, and carbon bisulphide ............. Nil. 



Sugar carbon .................... Nil. 



Sugar carbon plus two caps ............... Nil. 



Sugar carbon plus two caps plus potassium chlorate ....... Nil. 



Sugar carbon plus two caps plus potassium nitrate ....... Nil. 



Sugar carbon, two caps, potassium chlorate arid iron ...... Nil. 



Sugar carbon, sulphur and reduced iron .......... . Nil. 



Cotton wool soaked in solution of potassium nitrate atid dried . . . Nil. 



Iron filings and fulminate ............... Nil. 



Cotton wool soaked in HF., iron and two caps ........ Nil. 



Cotton wool, iron fluoride and caps ............ Nil. 



Sodium fluoride, sugar carbon and fulminate ......... Nil. 



Sodium fluoride and cotton wool ............. Nil. 



Cotton wool, carbon bisulphide and iron filings ........ Nil. 



Cotton wool, carbon bisulphide and fulminate ......... Nil. 



Gun cotton, carbon bisulphide, fulminate and irou ....... Nil. 



Sodium fluoride, iron, fulminate and sugar carbon ....... Nil. 



Sodium fluoride, iron, fulminate, gun cotton, sugar carbon and iron Nil. 



chloride. 



Sodium fluoride, iron chloride, gun cotton, and graphite ..... Nil. 



Rouge, reduced iron, sugar carbon and carbon bisulphide ..... Nil. 



Rouge, reduced iron, sugar carbon and sulphur ........ Nil. 



Aluminium, rouge, graphite and chlorate .......... Nil. 



Rouge, iron fluoride, chlorate, graphite and caps ........ Very small residue; doubtful. 



Bullet fired into barrel filled with acetylene and screwed into steel Nil. 



block containing cavity, mouth of barrel closed by gold beater skin. 



(C) EXPERIMENTS AT ATMOSPHERIC PRESSURE. 

 All experiments allowed to cool by radiation only unless otherwise stated. 



RKSULT. 



Aluminium, magnesium, carbon, iron, ferric oxide, olivine, and boric Nil. 



anhydride fused in wind furnace. 

 Aluminium carbide fused in carbon crucible by arc, iron added and then Nil. 



sand, heated for 3 minutes. Ingot of iron obtained and a greenish-blue 



slag (A1 2 O 3 . SiO 2 ) charged with carbon. 



Aluminium carbide melted and run into molten sand in carbon crucible . Nil. 



Aluminium carbide and iron heated in carbon crucible ....... Nil. 



Iron pipe packed with graphite melted in electric furnace and then Nil. 



dropped into sulphuric acid with layer of mercury on bottom. 

 Calcium silicate fused in electric furnace, graphite added and molten iron Nil, 



dropped on to it. 

 Various Moissan experiments when quickly cooled gave good results, 



r 2 



