is it for melting the wax out of the massive clay mold which is positioned vertically with the breech end lowest (for greater breech density to prevent bursting) into which the molten bronze or iron will be poured around the bore placed centrally in the the clay mold? Otherwise known as "lost wax casting".
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"Only two things are infinite; The Universe and human squirrelyness; and I'm not too sure about the Universe"
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