THE ARTIFICIAL PRODUCTION OF DIAMOND. 



95 



EXPERIMENT. 

 4-inch mould; T 9 F -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 ; T Vmch 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 l 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 tons 



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, lampblack and water 



round, 10 tons pressure, 18 k.w.m. total heating, heating 1 minutes, 



much gas produced. 

 4-inch mould ; J-inch core, magnesite round, iron turnings on top, Dhen 



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; f-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 ; J-inch iron rod core, olivine and 5 per cent, carbon round, 



100 tous pressure, 4 k.w.m. total heating, heating 1 minute. 

 2-inch mould ; f-inch carbon rod core, ^-inch iron in centre, sodium 



carbonate round, 100 tons pressure, 4 k.w.m. total heating, heating 



10 seconds, charge detonated, mould swelled ^-inch in diameter, charge 



blew out top and bottom. 

 Carbide mixture = CaC 2 1, Si0 2 2, A1 4 C 3 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. 



