Bomb Sight, Sighting Head for T-1 Bombsight System F4U Corsair when the firing switch is

when the firing switch is depressed

automatic Type K-4 Computing Gun Sight used in the Sperry ball turret in WWII-era heavy bombers such as the B-17 Flying Fortress and B-24 Liberator

In the standby mode

as well as a BAC order number (Boeing Aircraft Corp)

This fuel gage indicates total fuel quantity contained in the tank located in one of two Outboard wing tanks

Bomb Sight, Sighting Head for T-1 Bombsight System F4U Corsair when the firing switch isThe World War II T 1 bombsight system was originally designed by the British (as the Mark XIV bombsight) and first entered service in 1942. It was used in versions of the US Army Air Force B 24 Liberator, B 25 Mitchell bombers, as well as the British Avro Lancaster and deHavilland Mosquito bombers. This T 1 Sighting Head was made by AC Spark Plug division of GMC. The system included a sighting head connected to a mechanical (pneumatic) computer.