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. ALS signed “J. Chadwick,” one page, 5.5 x 3.5, personal letterhead, July 2, 1973. Response to an autograph request. In full: “I have, as requested, put my signature on each of the 3 envelopes you sent. I have not previously seen the postage stamps which you put on the return envelope—most interesting.” In fine condition. Pre-certified PSA/DNA.
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