Tap
The quantity of metal which runs from a furnace or cupola, from the time of opening or tapping to that of closing or botting up, is called a tap. A large ladle is said to be filled at one or more taps, as the case may be.
Twelve hundred entries from the golden age of cast metal — how bells are founded, why brass is not bronze, what a cupola melts and a core withstands — by Simpson Bolland, the trade's great teacher.
The quantity of metal which runs from a furnace or cupola, from the time of opening or tapping to that of closing or botting up, is called a tap. A large ladle is said to be filled at one or more taps, as the case may be.