8. Bohr, Niels. Typed letter signed (“N. Bohr”), 1 page (8.5 x 11 in.; 216 x 279 mm.), on Danish University of Copenhagen Institute of Theoretical Physics letterhead, in English, Copenhagen, Denmark, 23 June 1925, written to “President Kunz” George Frederick Kunz, American mineralogist who assembled the Morgan-Tiffany collection of gems in the American Museum of Natural History. Some chipping along edges with .75 in. tear on right margin.

Nobel Prize-winning physicist Niels Bohr presents the American Museum of Natural History with a sample of the element Hafnium – discovered in his native Denmark.

Bohr writes in full:
Dear President Kunz, It is a great pleasure on behalf of the Institute of Theoretical Physics in Copenhagen to present The American Museum of National [sic; Natural] History with a small sample of the element hafnium, which was discovered a few years ago by Professor Coster and Professor Hevesy working in this institute, and which has been obtained in pure state by Professor Hevesy. Very sincerely yours, N. Bohr

Niels Bohr made foundational contributions to understanding atomic structure and quantum theory, for which he received a Nobel Prize in Physics in 1922. Bohr founded the Institute of Theoretical Physics at the University of Copenhagen, now known as the Niels Bohr Institute, which opened in 1920. Hafnium, the chemical element to which Bohr refers in this letter, is a chemical element with the symbol Hf and atomic number 72. It is named after Hafnia, the Latin name for Copenhagen, where it was discovered. Hafnium is used in filaments and electrodes; some semiconductor fabrication processes use its oxide for integrated circuits. $500 - $700

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