Notes relating to pig and bar iron, 1763-1787, including observations on making and refining pig and bar iron; a draft report made whilst working at the forge at Trostrey that was intended for a House of Commons Committee, 1781; notes on working cast iron in a wood charcoal refinery; notes from the balling forge at Cefn Cribwr, including references to the Bassaleg and Machen forges; notes on the size of the blast furnace and weight of coke to be used; notes on using the forge hammer and anvil at Cefn Cribwr; and an envelope of undated fragments relating to processing techniques and experiments with acid.