in the glass-manufacture, a small hole or aperture of the furnace, one of which is placed on each side the boca, almost horizontally with it. Out of them the servitors take coloured or finer metal from the piloting pot.
in the glass-manufacture, a small hole or aperture of the furnace, one of which is placed on each side the boca, almost horizontally with it. Out of them the servitors take coloured or finer metal from the piloting pot.