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Trinity

 (Retrieved from Day of Trinity)
Raemer Schreiber lowering the uranium tamper plug containing the plutonium core into the Trinity device, the “Gadget”. Note the tapered pentagonal copper funnel that sits in-place of the final polar cap to protect the High Explosive (HE) blocks from damage during the insertion, afterwards this was removed and the final HE block set in-place later to be covered by the polar cap. (Retrieved from https://preview.redd.it/6tqwx4kv5eg71.png?width=960&crop=smart&auto=webp&s=2ebd7633c661b14536556664a18958bee107cf46)