Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force KC-97 On the dial there is

On the dial there is text which reads "Scade Radium 15-9-43"

and the repair activity on the F-I06 fighter-interceptor

The F marker was set to the desired Acceleration Altitude

USN 33451 has been etched on the back of the case

It red lines at 110degC

Compass, Magnetic, Type B-20 Vertical Card, WWII, US Army Air Force KC-97 On the dial there isHere 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