...Livingstone (1871) passed thirty smelting houses inone journey, and Cameron came across bellows with valves, andtribes who used knives in eating... 
W.E.B. Du Bois 「The Negro」
...In one place shut in by walls there were the remains of a smelting furnace, and with it old crucibles that showed patches of glaze with traces of gold still within them...
George Manville Fenn 「Dead Man's Land」
...This wasthe invention of the smelting of iron...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
...A large fume of what bore many marks of arsenic arose from the crucible during the time of smelting it...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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