hen used to cool the crucible. remember that the modern industry of carbide of cal- cium and the acetylene gas which comes from it is larger diamonds which will rival those produced by Cooling in melted metal may appear strange at first, due to the electric furnace. but we must remember that the… … The Chalk Block is So Poor a Conductor of 'Heat That In a Carbon Crucible the Mixture of Carbon The. Hand Can be Held Without Danger Over the Furnace, a Lump of Ice Placed upon It Melts but Slowly. Despite the 5,000 Degrees of Heat Within. and Iron is Poured, Which, After Fusing at' 5,000 Degrees,…
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