ROYAL AIR FORCE FIGHTER COMMAND, 1939-1945. - Gun harmonisation board at Biggin Hill, Kent, set up for a Supermarine Spitfire Mark IXB of No. 341 (Free French) Squadron RAF, which has been jacked up into a level flying position in the Blister Hangar fifty yards beyond by armourers of No. 3101 Servicing Echelon. The discs on the board have placed in order to harmonise the guns so that their lines of fire converge on a point 250 yards from the aircraft. The four small outside discs are the harmonising points for the four .303 Browning machine guns, while the larger discs inboard of these are for
ROYAL AIR FORCE FIGHTER COMMAND, 1939-1945. - Gun harmonisation board at Biggin Hill, Kent, set up for a Supermarine Spitfire Mark IXB of No. 341 (Free French) Squadron RAF, which has been jacked up into a level flying position in the Blister Hangar fifty yards beyond by armourers of No. 3101 Servicing Echelon. The discs on the board have placed in order to harmonise the guns so that their lines of fire converge on a point 250 yards from the aircraft. The four small outside discs are the harmonising points for the four .303 Browning machine guns, while the larger discs inboard of these are for the two 20mm cannon. The upper centre spot is for the pilot's reflector sight, and the lower spot to the left of centre is for the camera gun. , Royal Air Force, 3101 Servicing Echelon, Royal Air Force, Wing, 341
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