Instrument Calibration for Bombardiers, USAAF Manual RAAF also known fondly by pilots

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

This 65-page manual

It is missing the bubble mechanism

The permanent magnetic speed indicator contains a fixed permanent magnet

This electro-mechanical system computed positions based on a series of dead reckoning inputs

Instrument Calibration for Bombardiers, USAAF Manual RAAF also known fondly by pilotsThis 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.