English physicist (1891–1974) who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932, thus paving the way towards the fission of uranium-235 and the creation of the atomic bomb. Fountain pen signature, “J. Chadwick, January 1965,” on an off-white 3.5 x 1.5 card. In fine condition, with trimmed edges. Pre-certified PSA/DNA.
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