its other uses. Since it had a wide barrel, the projector could shoot nearly anything that could fit inside it; the most popular makeshift ammunition was potatoes. Ammunition See also Northover Projector, another World War II grenade throwing device AA Mine Discharger, a Japanese anti-aircraft mortar. Unrotated Projectile, another Royal Navy anti-aircraft weapon. Steam cannon, other steam-powered missile launchers References Notes General references Central Office of Information, British Coaster, 1939-1945, HMSO, 1947. Ministry of Information, Merchantmen at War: The Official Story of the Merchant Navy, 1939–1944, HMSO, 1944. External links Naval anti-aircraft weapons Grenade launchers of the United Kingdom Pneumatic mortars Military history of Cornwall Anti-aircraft guns of the United Kingdom World War II naval weapons of the United Kingdom British Merchant Navy Ingersoll Rand Weapons and ammunition introduced in 1940