A new treatise on artificial fireworks. [electronic resource] : Containing I. The Method of refining and pulverising of Salt-Petre. II. Of extracting Salt-Petre from damaged Gun-Powder. III. Of the Ingredients used in Fireworks. IV. To restore damaged Gun-Powder to its proper strength. V. Of the Compositions for Fireworks. VI. Of the proportion of Moulds for Sky-Rockets, Wheel-Cases, Serpents, &c. Vii. Of such Works as shew themselves in the Air. Viii. Of Works for the Water. IX. Of fixed, moveable, projected, and transparent Pieces. The whole illustrated with Five Copper Plates, exhibiting the Figures of several Pieces of Fireworks. By Robert Jones, Lieutenant in the Royal Regiment of Artillery.