A detailed history of each of five gunpowder mills operational in the Lake District from the 1790's onwards with information drawn from archive documents used to reconstruct their site layouts and operations plus a description of the process of combining charcoal, sulphur and saltpetre (potassium nitrate) in the correct proportions and grain size.  A Glossary of gunpowder terminology and an Appendix of accidental explosions completes the text.  Paperback.  52 pages.  Very good condition.  Cat No 3851