Automatic Computing Sights, Types K-3, K-4, K-5 Handbook RCAF The original face cushions have

The original face cushions have after 80+ years hardened with age

but without the bulbs

Winter Jungingen Hohenz

This is a WWII-era Directional Gyro Fl22561 as used in bombers Dornier Do-17

Automatic Computing Sights, Types K-3, K-4, K-5 Handbook RCAF The original face cushions haveThis is an original WWII era Preliminary Handbook of Service and Maintenance Instructions for the Sperry K series turret mounted Gun Sight, K 3, K 4, and K 5, dated Jan 1942. The K series sights were found in US Army Air Force bombers such as the B 17 Flying Fortress and B 24 Liberator, and used to fire 50 caliber machine guns. This 30 page handbook includes text, tables, illustrations, and fold out diagrams. It is in reasonable condition given its