WE D155023 photocell
This is a special unbased developmental phototube with a 360 degree annular field of view. It may have been the sensing element in infrared aircraft detection equipment being experimented on by the US Army Signal Corps before the development of practical radar, and also in artillery flash detectors.
Information provided by Bob Weiss N2IXK
This file was last modified
15:39:29, Tuesday September 02, 2014