Aircraft Recognition Manual, German for RAF Aircraft, "Britische Flugzeuge Erkennungshandbuch" A-26 The third APA-44 model was

The third APA-44 model was installed in a B-17 and employed with a new Western Electric search radar

25 inches diameter by 5 inches deep

This is a WWII-era Accelerometer AN-5475 aka Type B-3 as used in aircraft of the US Army Air Force such as in versions of the Boeing B-17

Reference Number 41-7952

Aircraft Recognition Manual, German for RAF Aircraft, "Britische Flugzeuge Erkennungshandbuch" A-26 The third APA-44 model wasHere is an authentic WWII era German Recognition Manual for Aircraft of the British Royal Air Force. The manual contains photos and silhouettes of 30 primary aircraft of the RAF in operation during the war. Each aircraft is described using 4 of 64 pages, including its key dimensions and armament. It appears to be early WWII as it includes some pre war RAF aircraft which were obsolete quickly and not later aircraft, as well as only early war US