Compass Module for RAF Course Setting Bomb Sight BOAC The compass body would be

The compass body would be contained in a cradle

Measures approximately 4 inches square and 2 inches deep

a)  no response (if the Safety Plug has not been inserted)

foldouts of cockpit pictures and instrument panel

and all toggles operate as they should

Compass Module for RAF Course Setting Bomb Sight BOAC The compass body would beThis 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.