Gunners Quadrant M1 with Case and Technical Manual, 1943 WW1 and the front page of

and the front page of the Collins sales brochure

two aluminum drift plates that screw onto the base plate

California

It was originally designed for use against German radar systems such as Rhubarb

The only issue is the plastic Delineation label on the top of the sight

Gunners Quadrant M1 with Case and Technical Manual, 1943 WW1 and the front page ofThis 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