The Little Boy was the first atomic weapon used in war, and as such a lot of articles have been written about it in the last 80 years, however the vast majority of them get this fundamental feature of it’s operation wrong.
Most of the diagrams have been modified from Wikipedia sources, credit goes to the creators:
In particular
https://en.wikipedia.org/wiki/Little_Boy#/media/File:Little_Boy_Internal_Components.png
https://en.wikipedia.org/wiki/Little_Boy#/media/File:Gun-type_fission_weapon_en-labels_thin_lines.svg
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