Gunners Information File USAAF Manual No 20, B-17, B-24, B-25 Royal Navy This corrects for the height

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

This master unit feeds

It is mostly filled with fluid and the compass card rotates

as used in aircraft of the US Navy such as the SBD Dauntless Dive Bomber

Similar to other radio compass indicators used in actual aircraft

Gunners Information File USAAF Manual No 20, B-17, B-24, B-25 Royal Navy This corrects for the heightThis 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