26.4 MB (1.2 MB compressed)
2563 x 3598 pixels
21.6 x 30.5 cm ⏐ 8.5 x 12.0 in (300dpi)
ARGONNE NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY ARGONNE NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY
Nuclear power patent. A figure from the patent application of Enrico Fermi and Leo Szilard on the invention of a 'neutronic reactor'. The patent was based on the design of the world's first atomic pile, CP-1. This was built at the University of Chicago's Stagg Field, and achieved its first chain reaction on 2 December 1942. The patent was filed in December 1944, but was not issued (as number 2,708,656) until 17 May 1955 for security reasons.
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