Power Venturi Tube, Single Throat, AN5805-1, Type A-3A F9F Cougar or it was sourced there

or it was sourced there

This is a Horsepower Indicator

uncages the compass card which would then rotate right or left

flight instruments

See the spec sheet in the photo gallery from the Index of Army Aeronautical equipment Volume 6 Instruments

Power Venturi Tube, Single Throat, AN5805-1, Type A-3A F9F Cougar or it was sourced thereThis is a nice specimen of the Single Throat Power Venturi Tube used across US military aircraft of the US Army Air Corps Force and US Navy before, during, and post WWII. The US Army Air Corps fighter P 39 Airacobra is an example of an aircraft which used this venturi. The US Navy's TBM Avenger Torpedo Bomber also used this venturi, see illustration from its Erection and Maintenance manual dated 1945. Power venturi tubes provide a source of vacuum for