Greener discussed Swaff Iron in 1835
http://books.google.com/books?id=oIEY4qL6_z0C&pg=PA30-IA1&dq=wiswould%27s+iron#PPA50,M1 "It is an iron which is composed of iron and steel filings, chippings of breeches pieces, and cuttings of the ends of the screws, lock plates, cocks, and the rough borings of barrels, and all other small scraps found in gun-makers' workshops. These are collected by the boys in each shop, and when they have accumulated sufficiently, are sold to the swaff-forger, and the proceeds are considered as drinking money."
