Japanese Army Shooting Practice Handbooks Set of 4 1939 F-8 Crusader The 35mm lens is a

The 35mm lens is a Bell & Howell ANSIX Type-V lens f/3

On the reverse of the metal base are performance limit graphs under various conditions of pressure altitude

C-117 A & B

shifts the index line in the small round window at ~19

It was also used in versions of US Army Air Force WWII fighters P-38

Japanese Army Shooting Practice Handbooks Set of 4 1939 F-8 Crusader The 35mm lens is aThis is an authentic set of four pocket handbooks of the Japanese Army, dated July 1939 (per Google Translate app) covering shooting practice. The books contain a number of illustrations of firing ranges, shooting positions, targets, firing trajectory, and ranges. About half of the pages are foldouts with charts and illustrations. Unfortunately, we are unable to translate this manual and cannot provide any additional information regarding its content.