Instrument Calibration for Bombardiers, USAAF Manual RAAF It is in very nice

It is in very nice shape for its age

"When a compass installation free from magnetic deviation is required

also known fondly by pilots as "the idiot's loop"

The rear panel is absent

Instrument Calibration for Bombardiers, USAAF Manual RAAF It is in very niceThis is an original WWII era manual of Instrument Calibration for Bombardiers, published by the US Army Air Forces Training Command. This manual instructs student bombardiers on the calibration procedures for the aircraft instruments upon which he will rely to effectively perform his duties. This manual is in very good condition given its age. About 30 pages in length.