Part of a fuzing manual for the Mark III atomic bomb, the postwar version of the Fat Man bomb dropped on Nagasaki. Alex Wellerstein: "This image gives away nothing at all that is secret today (and indeed, little that would have been secret after about 1960, when the casing of the bomb was declassified), but it still gives one a <em>frisson</em> to have a see-through image of an atomic bomb."