This book describes the history of aircraft guns, their ammunition and their installations in aircraft. It commences with a technical history covering the development of guns, their ammunition, and related issues such as mountings and sights. This is followed by chapters on aircraft installations covering all nations and an evaluation of their use in combat. Appendices include comprehensive tables of the gun installations of WWI combat aircraft with details and illustrations of the guns used and specifications of their ammunition. Comparative drawings and specifications of service weapons are provided, plus illustrations and data concerning their ammunition.