Flap Position Indicator B-24 Liberator, PB4Y Privateer, WWII GE DJ11 Oscar Fighter The center knob is to

The center knob is to set the desired course and to cage the gyro

Over 350 pages

An early model was delivered to Dayton late in 1945 and then subjected to an extensive flight test program primarily at Boca Raton

which measures 8 inches wide by 18 inches long by 11 high

Here is an early WWII-era Vertical Speed Indicator used in aircraft of the German Luftwaffe

Flap Position Indicator B-24 Liberator, PB4Y Privateer, WWII GE DJ11 Oscar Fighter The center knob is toThis is a Flap Position Indicator as used in the WWII era Consolidated US Army Air Force B 24 Liberator Heavy Bomber (see 2 cockpit photos and photo from the B 24 Pilots Manual dated 1944) and the US Navy's PB4Y4 Privateer Patrol Bomber (see photo from Flight Manual dated 1945). Made by General Electric, Type DJ11. The indicator provided visual information on the angle of extension of the wing flaps during take off and landing, measured from full up