Grade II* Listed Building
The Bristol based brass industry was at the heart of advances in metallurgy in the 1700s, the processes being employed for the production of brassware comprising: copper smelting; calcining of calamine; alloying of copper and calamine to produce brass; distillation of zinc from calamine; production of brass by speltering; brass battery and rolling; and annealing of brass.
Closely linked to this was the use of fuel, in particular developments which enabled the use of coal in preference to charcoal for the processing of metals. The scientific methods employed by the Bristol company were highlighted in the works of the Swedish scientist and philosopher, Emanuel Swedenborg, who described a laboratory at Baptist Mills in his book “Opera Philosophica et Mineralis” ("Philosophical and mineralogical works") published in 1734:
“A laboratory has been fitted up where they experiment on the different methods of converting copper into brass. It contains a large number of assaying ovens and furnaces and the machinery works by flowing water. There is a small hammer for testing how many blows the brass can endure without breaking; there are also teeth with which the brass is struck, but only once at any one point.”
i. The Art of Converting Red or Rosette Copper into Brass by means of Calamine Stone. Messes Galon & Duhamel Du Monceau,1749
ii. L’Encyclopedie, ou Dictionnaire Raisonne des Sciences des Arts et des Metiers. Diderot and D’Alembert. 1763
iii. The Bristol Brass industry: Furnace Structures and their Associated Remains, Joan Day, Journal of the Historical Metallurgical Society 22/1, 1988