Lower image: No 1 BOS furnace under construction. Newcastle 1962. Drives can be seen on either side of the trunnion ring, with the water-cooled hood above.
BOS or basic oxygen steelmaking was an innovation using pure oxygen under high pressure to charge the furnace with oxygen and with hot metal from a ladle and with scrap steel from the opposite sides of the working floor. Steel production was increased a whole lot.
from Giant Strides 1965 BHP Publicity Dept.