THE ARTIFICIAL PRODUCTION OF DIAMOND. 



97 



EXPERIMENTS. 



4-inch mould; packed with dry alumina, IJ-inch hole, J-inch carbon rod 

 core, iron, lampblack, carborundum, ferro manganese and thorium 

 nitrate round, sodium on top, 26 tons pressure, 20 k.w.m. total heating, 

 heating 1 minute 10 seconds. 



4-inch mould; packed with carborundum, lj-inch hole drilled in it, 

 J-inch carbon rod core, f-inch paper tube filled with iron and ferro 

 vanadium, carbon and iron round, sodium on top, 26 tons pressure, 

 20 k.w.m. total heating, heating 1 minute. 



4-inch mould; packed with anhydrous ferrous oxalate, ^-inch hole drilled, 

 ^-inch iron rod core, sodium round, ferrous oxalate on top, covered 

 with graphite, 26 tons pressure, 25 k.w.m. total heating, heating 



3 minutes. 



4-inch mould; packed with sodium chloride and carborundum, --inch 

 carbon rod core, 26 tons pressure, 25 k.w.m. total heating, heating 



4 minutes. 



4-inch mould ; alumina, rouge, magnesium chloride and calcium chloride, 



pressed ; 1 J-inch hole, -iuch carbon rod core, carborundum in hole, 



26 tons pressure, 15 k.w.m. total heating, heating 1 J minutes. 

 4-inch mould ; packed with carborundum, calcium carbide, aluminium 



carbide, sodium chloride, magnesium chloride, sulphur, iron tilings ; 



-inch hole drilled, carbon rod put in, carbon tetrachloride poured on 



top, covered with graphite, 26 tons pressure, 50 k.w.m. total heating, 



heating 13 minutes, charge blew out, mould dilated. 

 4-inch mould ; packed with alumina, -inch hole, ^-inch iron rod core, 



lead peroxide and carborundum placed in hole and on top, covered 



with iron filings, 26 tons pressure, 8 k.w.m. total heating, heating 



1 minute. 

 4-inch mould; packed with alumina, 1-inch hole, ^-inch iron rod core, 



rouge and carborundum in hole, 26 tons pressure, 50 k.w.m. total 



heating, heating 3 minutes. 

 4-inch mould ; packed with carborundum and 4 per cent, sodium 



carbonate, pressed at 16 tons, 1-inch hole drilled, |-inch carbon rod 



core, carborundum and sodium carbonate placed in hole, 2G tons 



pressure, 15 k.w.m. total heating, heating 3 minutes, formed grey solid 



which detonated when struck. 

 4-inch mould ; ^-inch carbon rod core, iron sulphide and sulphur round, 



then sodium silicate and lampblack, 26 tons pressure, 50 k.w.m. total 



heating, heating 2^ minutes. 

 4-inch mould; 1-inch carbon rod core, sodium silicate, alumina, rouge, 



magnesia, and lime round, 26 tons pressure, 40 k.w.m. total heating, 



heating 1J minutes. 

 4-inch mould; packed with artificial pyrope, 1-inch hole, |-inch carbon 



rod core, carborundum and sodium peroxide placed in hole, 26 tons 



pressure, 8 k.w.m. total heating, heating 3J minutes. 

 4-inch mould ; filled with sand, 1-inch hole, -ineh carbon rod core, filled 



hole with potassium nitrate and carborundum, 26 tons pressure, 



15 k.w.m. total heating, heating 1 minute. 



KESULT. 



Nil. 



Nil. 



Nil. 



Sodium carbide and silicon 

 formed. 



Green carborundum pro- 

 duced. 



Some crystals from centre 

 and also from ejected 

 matter. 



Nil. 



Some amorphous carbon and 

 silicate of iron. 



Sodium carbide and pale 

 green carborundum. 



Nil. 



Nil. 



Nil. 



Nil. 



