THE ARTIFICIAL PRODUCTION OF DIAMOND. 
93 
Experiment. 
2-inch mould; f^-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, 2-J- 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 piece, 
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 4 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.m. 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 If minutes. 
4-inch mould; 1-inch magnalium rod core, carbon round, 20 tons pressure, 
40 k.w.m. total heating, heating If 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. 
