THE ARTIFICIAL PRODUCTION OF DIAMOND. 
1)5 
Experiment. 
4-inch mould ; y^^-inch carbon core, slaked lime and sodium carbonate 
on the bottom, silver sand in middle, slaked lime on top, 30 tons 
pressure, 770 k.w.m. total heating, heating 30 minutes. 
4-inch mould ; yVi^^^h carbon core, sand and sodium hydroxide 5 per 
cent., 25 tons pressure, 40 k.w.m. total heating, iron melted from 
bottom pole, heating 30 minutes. 
Same experiment plus 10 per cent, lampblack, 25 tons pressure, 12 k.w.m. 
total heating, heating 1| minutes. 
4-inch mould; carbon core, containing 5 per cent, lime, sand round, 
25 tons pressure, 8 k.w.m. total heating, heating 1^ minutes. 
4-inch mould; carbon rod core with sodium carbonate, sand round 
as before, 25 tons pressure, 6 k.w.m. total heating, heating 
25 seconds. 
4-inch mould; carbon core, olivine, graphite, and water round, 10 tuns 
pressure, 12 k.w.m. total heating, charge blew out at base, the pellets 
would be charged with CO and H from water and carbon, heating 
2 minutes. 
4-inch mould; iron rod core, olivine, rubber shavings and vaseline round, 
10 tons pressure, 9 k.w.m. total heating, heating 45 seconds. 
4-inch mould; carbon core, pyrope round, Dippel’s oil and paraffin 
poured on top, covered with iron and graphite, 26 tons pressure, 
11 k.w.m. total heating, heating 15 seconds. 
4-inch mould; 1-inch carbon core, graphite and water round, 20 tons 
pressure, 8 k.w.m. total heating, heating 15 seconds. 
4-inch mould; 1-inch carbon core, iron oxide, Jampblack and water 
round, 10 tons pressure, 18 k.w.m. total heating, heating 1^ minutes, 
much gas produced. 
4-inch mould; f-inch core, magnesite round, iron turnings on top, then 
carbon bisulphide, 20 tons pressure, 8 k.w.m. total heating, heating 
1| minutes. 
4-inch mould; 1-inch carbon core, 2-inch paper tube, filled with iron 
filings, sand round, cast-iron borings on top, carbon and tetrachloride 
of carbon above, 10 tons pressure, 20 k.w.m. total heating, action very 
vigorous, solid iron core formed round carbon, and the whole of the 
sand was permeated with deposited carbon and iron chloride, heating 
4 minutes. 
2-inch mould; |-inch carbon rod core, 1-inch paper tube filled with 
carborundum and iron sulphide, sand and sulphur round, 10 tons 
pressure, 6 k.w.m. total heating, silicon formed, heating 22 seconds. 
2-inch mould; ^-inch iron rod core, olivine and 5 per cent, carbon round, 
100 tons pressure, 4 k.w.m. total heating, heating 1 minute, 
2-inch mould; |-inch carbon rod core, i-inch iron in centre, sodium 
carbonate round, 100 tons pressure, 4 k.w.m. total heating, heating 
] 0 seconds, charge detonated, mould swelled |-inch in diameter, charge 
blew out top and bottom. 
Carbide mixture = CaC 2 1, Si02 2, AI4C3 3, FeS 16, Mg 2 parts by weight. 
Result. 
Nil. 
Some crystals from centre 
which burnt in oxygen. 
Nil. 
Nil. 
Nil. 
Pellets of iron shot out, 
which gave several good 
crystals. 
Nil. 
Nil. 
Nil. 
One good crystal from iron 
buttons. 
Nil. 
Nil. 
Nil. 
Nil. 
One or two crystals from 
iron. 
