THE ARTIFICIAL PRODUCTION OF DIAMOND. 



93 



EXPERIMENT. 



2-inch mould ; ^j-inch carbon rod, titanium oxide bridge piece, 30 tons 

 pressure, 10 k.w.m. total heating, carbon fused, heating 11 seconds. 



4-inch mould ; graphite neck, marble bridge piece, 20 tons pressure, 

 60 k.w.m. total heating, heating minute. 



2-inch mould ; graphite rod core, calcium carbide plus 10 per cent, 

 sulphur packed round, 24 tons pressure, 2J k.w.m. total heating, 

 heating 25 seconds. 



Ditto plus carbon tetrachloride 



2-inch mould ; carbon core, ferric oxide and 20 per cent, sugar charcoal 

 round, graphite on top, 24 tons pressure, 2 k.w.m. total heating, 1 ton 

 gaseous pressure when somewhat cooled and ram released, heating 



5 seconds. 



4-inch mould; graphite core, charcoal and 10 per cent, arsenic round, 



20 tons pressure, 13 k.w.m. heating, heating 10 seconds. 

 4 inch mould; graphite core plus 5 per cent, sulphur, willow charcoal 



round, 20 tons pressure, 16 k.w.m. total heating, heating 10 seconds. 

 4-inch mould ; carbon rod core, sand below around lower pole p'iece, 



carbon tetrachloride to give fluid pressure throughout whole, perforated 



iron disc to bring current to top carbon, 10 tons pressure, 3 k.w.m. 



total heating, about \ ton gaseous pressure when somewhat cooled and 



ram released, soft amorphous carbon and silicide of carbon formed, 



heating If minutes. 

 2-inch mould ; iron core, .potassium ferrocyanide round, graphite on top, 



40 tons pressure, 1 k.w.m. total heating, heating 4 seconds, cone 



melted, current interrupted. 

 4-inch mould ; carbon rod core surrounded with aluminium carbide, 



carbon dioxide snow and charcoal, 10 tons pressure, 18 k.w.m. total 



heating, heating 5 minutes. 

 4-inch mould; carbon rod core, reduced iron and carbon bisulphide 



round, 10 tons pressure, 20 k.w.ra. total heating, heating 3 minutes, 



action complete. 

 2-inch mould; aluminium rod core, wood charcoal round, 20 tons 



pressure, 6 k.w.m. total heating, heating 1 minute. 

 2-inch mould ; magnesium rod core, carbon round, 20 tons pressure, 



6 k.w.m. total heating, heating \\ minutes. 



4-inch mould ; 1-inch magnalium rod core, carbon round, 20 tons pressure, 



40 k.w.m. total heating, heating 1 minutes. 

 2-inch mould ; f-inch calcium rod core, carbon round, 20 tons pressure, 



3 k.w.m. total heating, short circuit producing some iron which would 

 be rapidly cooled, beating 8 seconds. 



4-inch mould ; f-inch sodium rod core, carbon round, 10 tons pressure, 



4 k.w.m. total heating, 4 tons of gaseous pressure when ram released, 

 heating 20 seconds. 



2-inch mould ; carbon rod core, sodium chloride round and graphite on 

 top, 20 tons pressure, 1 k.w.m. total heating, heating f minute, carbon 

 rod eaten. 



o 2 



RESULT. 

 Two good crystals. 



Nil. 



Nil. 



Nil. 

 Nil. 



Nil. 



Nil. 

 Nil. 



Nil. 



Nil. 

 Nil. 



Nil. 

 Nil. 



Nil. 

 A few crystals. 



Nil. 

 Nil. 



