Ball Turret Azimuth Position Indicator, B-17, B-24 B-29 and the PBY5A Catalina Seaplane

and the PBY5A Catalina Seaplane (which used 2)

and US Navy's PBY5A Catalina and PB4Y Privateer

dated 1945 (see document under Downloads):

Used in most US bombers during WW2

this indicator was used in fighter P-47 Thunderbolt (see photo of P-47 instrument panel from its flight manual dated 1945)

Ball Turret Azimuth Position Indicator, B-17, B-24 B-29 and the PBY5A Catalina SeaplaneThis is a mechanical Ball Turret Position Azimuth Position Indicator, Sperti part number 11585, used in the Sperry ball turret in WWII era heavy bombers such as the B 17 Flying Fortress and B 24 Liberator. Mounted within the ball turret at the right foot of the ball turret gunner (see photo), it was connected to a rotating mechanical control cable. The round turret silhouette in the center of the dial rotated as the turret rotated relative to the