The scientific tourist #358 — “Little Boy” atomic bomb arming plugs

Courtesy of the Smithsonian Air & Space Museum’s Udvar-Hazy Center, here are two small bits of history you’ve likely never seen before — arming plugs for the “Little Boy” atomic bomb:

"Little Boy" Atomic Bomb Arming Plugs

From the placard:

Small metal plugs were used by the Enola Gay weapons officer to arm the atomic bomb dropped over Hiroshima on August 6, 1945. He removed three green plugs that kept the firing circuitry inactive and replaced them with red plugs that closed the circuits. These plugs were found in the navigator’s compartment of the Enola Gay during restoration. It is not known whether the green “safe” plug is from the “Little Boy” atomic bomb or was used on a practice mission. The red plug was probably a spare.

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