Navigational Computer, Radar, Doppler, XN-1/APN-67 US Navy C-119 The green & red tape

The green & red tape markings on the glass indicate the max limits for the aircraft in which it had been installed

The instrument contains a bellows for measuring change in altitude/barometric pressure and a rotating strip chart recorder drum

air-to-air and air-to-ground attacks

Model A-11-24 likely 1950-1960's vintage

landing gear

Navigational Computer, Radar, Doppler, XN-1/APN-67 US Navy C-119 The green & red tapeNow here's a very interesting instrument for our aeronautical navigation historians: The XN 1 APN 67 was a development stage (XN 1 = Experimental Navy, Series 1) navigational computer used in a Doppler radar system in the early 1950's, designed by Ryan Aeronautical, tested in the US Navy's P 2 Neptune, intended for the P6M 1 Seamaster, and eventually used during "Project Magnet" in the R5D Skymaster and the Lockheed NC 121. The computer measures ~8