Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force Vulcan The part numbers have been

The part numbers have been confirmed in the TBM Avenger Erection and Maintenance Manual dated August 1945

The housing had been repainted at one point

and by the USAF as the Low Altitude Bombing System

This C-2 was made by Pioneer

Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force Vulcan The part numbers have beenHere 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