The art of gunnery : wherein is described the true way to make all sorts of gunpowder, gun-match, the art of shooting in great and small ordnance, excellent ways to take heights, depths, distances, accessible or inaccessible, either single or divers distances at one operation to draw the map or plot of any city, town, castle, or other fortified place, to make divers sorts of artificiall fire-works, both for war and recreation, also to cure all such wounds that are curable, which may chance to happen by gunpowder or fire-works : this treatise is composed for the help of all such gunners and others, that have charge of artillary, and are not well versed in arithmetic and geometry : all the rules and directions in this book being framed both with and without the help of arithmetick /