Earths, and the slag 64.6 and 2 7.45% of the same respectively.
The slag and matte formed float upon the lead in the crucible and are tapped, usually together, at intervals into slag-pots, where the heavy matter settles on the bottom and the light slag on the top. When cold they are readily separated by a blow from a hammer.
Proctor in 1877 directed attention to the composition of the slag resulting from the burning of esparto, which they found to be strikingly similar to that of average medical bottle glass, the latter yielding on analysis 66.3% of silica and 25.1% of alkalies and alkaline.
Weld steel is slag-bearing iron malleable at least at some one temperature, and containing more than 0.30% of carbon.
These foliaceous heaps lie along the bank like the slag of a furnace, showing that Nature is "in full blast" within.