The book "The art and mystery of curing, preserving, and potting all kinds of meats, game, and fish; also the art of pickling and the preservation of fruits and vegetables. By J.R, 1864" is available on google books
Link to book
It makes an interesting read: not least the Leicestershire Spiced Bacon from my home County (which I have never seen or heard of!).
The Nitrate levels will require adjustment before use to meet modern curing standards.
Phil