I never realised before that night vision goggles were meant to make everything look as if it was night.
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Well spotted, PW. Although the Imperial War Museum list this device as "Telescope, Identification, AA, MkIII (Rangefinder, cased)", if you read the 1938 instructions here there is no mention of any rangefinding going on at all. In fact, it is two telescopes laid end-to-end; the junior ATS girl would pick up the intruder using the low-power telescope, then the senior ATS girl would identify it using the high-power side, and the azimuth and elevation would be read off and passed to the central computer (human!).]
Ah! Thanks for that, Brother of Jim. You can learn something new every day. The device might come in useful against drones one day. PW
Last edited by Penny Washers; 11th Dec 2016 at 13:54.