THE ARTIFICIAL 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 curbon crucible, cooled 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. (> 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) A hour 



Passed iron pentacarbonyl over magnesium oxide (redness) 1 hour . . . 



Passed iron pentacarbonyl ovor 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. (*> 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 1 i 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 bisulphide 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, but 

 would not burn in oxygen. 



Nil. 



Nil. 



Nil. 



Nil. 



Nil. 



All nil. 



All nil. 



Nil. 

 Nil. 



