Gunners Information File USAAF Manual No 20, B-17, B-24, B-25 Royal Navy Similar to other radio compass

Similar to other radio compass indicators used in actual aircraft

This corrects for the height of the seated pilot by aligning his line of sight with the silhouette and the tilting horizon marking behind it while in level flight

likely from a two-seat MiG-15 UTI trainer made by the Shenyang Aircraft Factory and designated in China as the JJ-2 (from Wikipedia)

Ref 6A/4721

It is mostly filled with fluid and the compass card rotates

Gunners Information File USAAF Manual No 20, B-17, B-24, B-25 Royal Navy Similar to other radio compassThis WWII era bound edition of the US Army Air Force's Gunners Information File consists of several separate WWII era manual publications combined into one hardback volume, dated May 1944. This manual is focused on those gun systems used in B 17, B 24, B 25, and B 26 bombers but is pre B 29 Central Fire Control (so no B 29 specific content) . The first section of describes the operation and maintenance of the . 50 Caliber Browning M2 Aircraft Machine