Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force Vulcan a microphone trigger switch

a microphone trigger switch

The housing had been repainted at one point

the need for the contactor disappeared and true IFF (Identification Friend or Foe) transponders took their place

and by the USAF as the Low Altitude Bombing System

and comes in its original box

Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force Vulcan a microphone trigger switchHere is a WWII era Type B 20 Direct Reading Magnetic Compass, made by Autoflight, part number 2221. The B 20 Compass design is unique in that it contains a magnetic horizontal float suspended in damping fluid that engages the directional pointer on a vertical compass card to display direction. The pointer indicates the direction of aircraft flight. The knob in the lower left corner manually rotates the course indicating pointer (i. e., the two