Papers relating to the planning and building of a forge at Rogerstone and a blast air furnace at Cefn Cribwr, 1766-1788, including notes on the design and structure of the forge and furnace; records of the dimensions and materials agreed upon with the builders; papers concerning firebricks for the furnace; and notes on settling the forge hammer and on improving the forge bellows at Cefn Cribwr. The file also contains a drawing by John Bedford of furnace blowing cylinders at Ketley Furnace, Shropshire, in 1772.