Gyro Flux Gate Compass System Operations and Service Instructions 1944 Smiths B-25 Mitchell bombers

B-25 Mitchell bombers

It appears to be New Old Stock as the red protective paper disc over the vacuum filter is still in place

is fastened to the upper edge of the compass bowl

The Altitude Selector Switch allowed the pilot to set the lower altitude limit over the terrain

Once the aircraft reaches 5000 Meters

Gyro Flux Gate Compass System Operations and Service Instructions 1944 Smiths B-25 Mitchell bombersThis is an original WWII era manual of Operations and Service Instructions for the Gyro Flux Gate Compass System, dated 1944. The Gyro Flux Gate Compass System was used in aircraft of the US Army Air Force such as heavy bombers B 17, B 24, and B 29. The 7 component Flux Gate Compass system, a technological innovation of its day, was designed to provide accurate navigational guidance using the earth's magnetic forces by minimizing interference from the