F9F-8 Panther Fighter Cruise Control / Rest / Climb-Descent Combination Computer 1956 F-94 It appears that the lens

It appears that the lens can be removed and the upper and lower operating limit indicators can be set by sliding the triangular pointers along the scale (we have not attempted this in order to preserve the artifact)

though slow

This is a WWII-era Exhaust Differential Pressure Gauge

The K-series sights were found in US Army Air Force bombers such as the B-17 Flying Fortress and B-24 Liberator

which allowed the RDF stations to determine a fix (but also prevented the pilot transmitting during a period indicated by the arc on the dial)

F9F-8 Panther Fighter Cruise Control / Rest / Climb-Descent Combination Computer 1956 F-94 It appears that the lensThis 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 8 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.