Wheel and Flap Position Indicator, Type A-2 C-47 as well as for radar

as well as for radar sets AN/APS-3 and - 4

It contains the essential information on the duties and responsibilities of the bombardier

The US Army Air Corps fighter P-39 Airacobra is an example of an aircraft which used this venturi

There is a handwritten note by unknown author "Al" on the inside cover:

it was fitted to the Lancaster

Wheel and Flap Position Indicator, Type A-2 C-47 as well as for radarThis is a WWII era Wheel and Flap Position Indicator, Type A 2, as used in aircraft of the US Army Air Force and US Navy with tail wheel landing gear. According to the Maintenance and Interchangeability Chart dated Feb 1945, the A 2 indicator was used in early versions of fighter P 47 Thunderbolt (see image of the P 47 instrument panel from its flight manual dated 1943) and transport C 46 Commando. It was also used in the fighter P 40F Warhawk