Winner of the 1935 Nobel Prize in Physics, he discovered and proved the existence of neutrons, thus paving the way towards the fission of uranium 235 and the creation of the atomic bomb. Two items: ALS, one page signed, “J. Chadwick,” personal letterhead, April 15, 1966. Chadwick writes to an admirer, in full: “I trust that I have signed this envelope as you requested. I am interested to see that Einstein is commemorated in this way”; and an FDC honoring Albert Einstein, signed in ink, “J. Chadwick, April 1966.” Light creasing, toning, and some trivial soiling to the FDC, otherwise fine condition. RRAuction COA.
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