1945 ... a real mind-blower!

... I knew that the actual core of fissionable material in an A-Bomb was relatively small- say the size of a baseball- but I've never seen an accurate 3-D type illustration. Now I have. Keep in mind that a six foot man would be about the height of that rear fin assembly. 

(pictured Mark III A-bomb)

all images- Right click- open in New Window= super colossal size!