F9F-6 Panther Fighter Cruise Control / Rest / Climb-Descent Combination Computer 1952 Anson The knobs are quite stiff

The knobs are quite stiff and need some TLC

25 inches diameter and ~6 inches deep

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

It is presumed to be a WWII-era indicator used in aircraft of the Japanese Army or Navy

we may never know

F9F-6 Panther Fighter Cruise Control / Rest / Climb-Descent Combination Computer 1952 Anson The knobs are quite stiffThis is a Korean War era Flight Computer designed specifically for the US Navy's jet fighter, the Grumman F9F 6 Panther, equipped with twin J 48 P 6A engines. It includes a Rest Computer (Rest meaning not flying under combat conditions) on one side and a Climb Decent Tabulator on the opposite side. these are essentially 2 disc, 7 inch circular slide rules.