Compass Module for RAF Course Setting Bomb Sight BOAC This is an original Cold-War-era

This is an original Cold-War-era Gunnery Manual for the USAF's strategic bomber Boeing B-36 and RB-36 Peacemaker

and all toggles operate as they should

that is in a left turn the lubber line moves to the left round the dial

BU AERO USN is embossed on its face

Compass Module for RAF Course Setting Bomb Sight BOAC This is an original Cold-War-eraThis direct reading magnetic compass module was used in the "Wimperis" Course Setting Bomb Sight of the British Royal Air Force. The compass body itself is housed within a metal container with gear teeth surrounding the base. These teeth engaged the CSBS mechanism to assist in the approach to the intended bomb target. See an example of the bomb sight here. The fluid from this compass has since evaporated. But it is still a fine specimen given its age.