This video details the pre-WW2 3.25-inch Anti-Aircraft Rocket, highlighting its innovative Photo-Electric Proximity (PERF AR) fuze developed by the NDRC. It explains the fuze's shadow detection mechanism using a toroidal lens and photo cell, which triggered a thyratron and electric detonator. The program was eventually superseded by radio proximity fuzes and terminated in 1943, with this being the last known surviving example.
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