Radio Altitude Indicator Altimeter ID-14A/APN-1 for Radio Set AN/APN-1 WWII GE

Description

The WWII-era Radio Altitude Indicator, ID-14A/APN-1 was a component of Radio Set AN/APN-1, used to measure and indicate to the pilot the altitude over the terrain during flight.  Made by Roller-Smith.  See image of technical description of the system.
The Radio Altimeter was used in a number of aircraft of the US Navy where close monitoring of height over terrain was critical, such as torpedo bomber TBM Avenger (see image from TBM Flight Manual), dive bomber SB2C Helldiver, patrol aircraft PV-1 Ventura, PV-2 Harpoon, PBY Catalina, PBM-5 Mariner, and PB4Y Privateer.  It was also common in aircraft of the US Army Air Force such as the C-47 Skytrain transport, as well as Korean War-era aircraft such as the A-1 Skyraider.
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