Gunners Quadrant M1 with Case and Technical Manual, 1943 WW1 California

California

From FLIGHT Magazine April 1954 PPs 390-391

two aluminum drift plates that screw onto the base plate

The glass for #1-2 needs cleaning from the inside

25 inches diameter and ~2

Gunners Quadrant M1 with Case and Technical Manual, 1943 WW1 CaliforniaThis is a WWII era M1 Gunners Quadrant, a portable precision leveling instrument used for laying artillery weapons in elevation, measuring their angles of elevation, and checking the elevation mechanisms of fire control equipment. The Gunners Quadrant was also used to level the guns of aircraft such as the B 29 Superfortress and to harmonize the guns with their gun sights. See image of page 67 from the B 29 Gunnery Manual describing the Quadrant. The