Radar Indicator, CS-55ACE, ASD Surface-Search, WWII US Navy Eurofighter Typhoon It has a calibration mechanism

It has a calibration mechanism

The crystal glass was secured by a bezel and gaskets to seal the movement against dust

the gyro produced vertical attitude signals which were amplified and transmitted to the autopilot system and indicators on the flight deck of the aircraft

The indicator is a CS-55ACE indicator for a WW2 US Navy Type ASD surface-search radar system

Radar Indicator, CS-55ACE, ASD Surface-Search, WWII US Navy Eurofighter Typhoon It has a calibration mechanismThe indicator is a CS 55ACE indicator for a WW2 US Navy Type ASD surface search radar system. The ASD was the first effective American microwave search radar, and was used in aircraft such as the US Navy's Patrol Bomber Lockheed PV 1 Ventura, PV 2 Harpoon, and Grumman TBF Avenger. Researching the internet reveals that Type ASD X band airborne search radar used this indicator as a B scope (range vs bearing) in US Navy patrol aircraft to detect ships