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 both sides, 5.25 x 7, personal letterhead, December 31, 1971. Letter to Mr. Pitts. In part: “I am sorry to learn that your heart condition forbids any physical exertion. I sympathise with you. I am myself not quite in that state, but I have had some nasty collapses recently and my doctor has ordered a complete rest for some months from any physical exertion—especially the latter.” In fine condition. Pre-certified PSA/DNA.
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