The iron plate is referred to in the Moxon book also;
"in the back of the Forge against the Fire-placers fixed a thick Iron Plate, and a taper Pipe in it about five Inches long, called a Ttwd, or (as some call it) a Tewel-Iron marked *,which Pipe comes through the Back of the Forge, as at C. into this taper PipeorT^W is placed the Nose, or Pipe of the Bellows. "