THE ARTIFICIA]. PRODUCTION OF DIAMOND. 
103 
Experiment. 
Same experiment with ferro-titanium. 
Iron melted in carbon crucible, aluminium carbide, iron sulphide and 
silica added, steamed, quenched in water. 
Heated iron, magnesium, strontium oxide and calcium, cooled in water . 
Heated iron, tin, bismuth, antimony, and ferro-vanadium, cooled in 
water. 
Heated iron, lead, silver, copper, cooled in water.. 
Silica 4, magnesia 5, rouge 1, parts by weight, carborundum and iron 
melted in electric furnace on graphite bed. 
Melted a round steel file by arcing under oil. 
Heated chromium oxide and carborundum in carbon crucible, coolecl in 
water. 
Fused calcium carbide and added potassium chlorate, cooled in water . . 
Passed hydrogen for 1 hour over carborundum No. 6 grit, heated cherry 
red, grit unaltered. 
Passed CO for 1 hour over carborundum No. 6 grit, heated cherry red, 
grit very little altered. 
Passed iron pentacarbonyl over carborundum No. 6 grit, heated nearly 
red for 3 hours, the grit was much etched. 
Passed iron pentacarbonyl over magnesium (redness) 1 hour. 
Passed iron pentacarbonyl over magnesium carbonate (redness) | hour . 
Passed iron pentacarbonyl over magnesium oxide (redness) 1 hour . . . 
Passed iron pentacarbonyl over carborundum No. 6 grit and sodium 
chloride (redness) 1 hour, the grit was etched. 
Passed iron pentacarbonyl over carborundum No. 6 grit, sodium chloride 
and iron filings, orange heat 20 minutes. 
Passed the following over carborundum No. 6 grit contained in a silica 
tube heated to varying temperatures along its length from just red 
to white heat for periods varying from 20 minutes to 14 hours; 
cyanogen, nitrogen, nitric acid gas mixed with iron pentacarbonyl; 
chlorine gas; ammonia gas ; CO^ and CO; ammonium chloride 
vapour ; sulphuretted hydrogen ; acetylene; coal gas. 
Passed iron pentacarbonyl over the following substances, heated in a 
silica tube for varying lengths of time ; magnesium silicide; silicon, 
magnesium and calcium alloy; graphite ; ferro silicon; ferro silicon 
and magnesium alloy ; ferro silicon, magnesium powder and sodium 
chloride; iron sulphide; ferrous carbonate; ferrous ammonium 
sulphate; sodium; potassium and magnesium sulphates; calcium 
silicate; magnesium silicate; cadmium ; artificial pyrope; ferro 
manganese; silicon and manganese; chromium; silicon, manganese 
and carbon alloy; finely divided nickel; sodium silicate ; nickel and 
sand. 
50 per cent, ferro silicon in silica tube heated to 1300° C., carbon 
bisulphide vapour passed over it for half an hour. 
Silicon heated to 1100° C. in silica tube, carbon Insuljrhide vapour passed 
over it for half an hour. 
Result. 
Etching deeper. 
Crystals which burnt in 
oxygen. 
Nil. 
Nil. 
Nil. 
Octahedra (spinels) which 
would not burn in oxygen. 
Nil. 
Nil. 
Nil. 
Nil. 
Nil. 
Several plates, thought to be 
correct at the time, liut 
would not burn in oxygen. 
Nil. 
Nil. 
Nil. 
Nil. 
Nil. 
All nil. 
All nil. 
Nil. 
Nil. 
