OFFPRINTS OF TWO PAPERS BY BLACKETT, INCLUDING HIS FAMOUS PHOTOGRAPHIC PROOF THAT RADIOACTIVITY COULD PRODUCE ALPHA DECAY, AND HIS DISCUSSION OF DUAL-CAMERA CLOUD CHAMBER SET-UPS, TWO PAPERS THAT CONTRIBUTED TO HIS BEING AWARDED THE 1948 NOBEL PRIZE IN PHYSICS. More

FIRST EDITION, OFFPRINT ISSUE, INSCRIBED BY NIELS BOHR, of Bohr's Nobel Prize lecture, delivered on the occasion of Bohr's acceptance of the 1922 Nobel Prize in Physics. An association copy: Inscribed to J.A. Christiansen, noted scientist and student of Bohr. More

FIRST EDITIONS of two critical papers in developing our understanding of the atom: 1) all three parts of Bohr’s landmark work marking the definitive break from using classical physics at the atomic level, often cited as the foundation of our modern understanding of the atom; 2) both parts of Moseley's..... More

FIRST EDITION IN ORIGINAL WRAPPERS OF BORN’S NEW MATHEMATICAL DESCRIPTION OF QUANTUM PHYSICS, INCLUDING THE FIRST USE OF THE TERM "QUANTUM MECHANICS." More

FIRST EDITION IN ORIGINAL WRAPPERS of the famous “three-man paper,” the first, complete, self-consistent description of quantum mechanics. More

THE CAVENDISH EXPERIMENT: FIRST EDITION IN EXTREMELY SCARCE ORIGINAL WRAPPERS OF THE REPORT OF CAVENDISH’S EXPERIMENT TO DETERMINE THE DENSITY OF THE EARTH AND NEWTON’S GRAVITATIONAL CONSTANT “G”, ONE OF THE MOST FUNDAMENTAL UNIVERSAL CONSTANTS. More

FIRST EDITION IN ORIGINAL WRAPPERS of Debye’s explanation of the dual wave-particle nature of electromagnetic radiation (the “Compton effect”). Precedes the full account by Compton. More

FIRST EDITION IN ORIGINAL WRAPPERS of Dirac’s general transformation theory, his own favorite paper and “the pinnacle of Dirac's development of quantum mechanics,” unifying “all proposed versions of quantum mechanics, as well as giving rise to a continuum of other possible versions” (Richard Dalitz). More

AN EXTRAORDINARY LETTER BY EINSTEIN TO HIS SON OFFERING LIFE ADVICE AND DISCUSSING FREUD, SHAKESPEARE, AND SCHILLER. More

FIRST EDITION IN ORIGINAL WRAPPERS of one of Einstein's major papers on the modification of general relativity and the beginning of his unified field theory. More

FIRST EDITION, FIRST PRINTING, IN ORIGINAL WRAPPERS of Einstein’s paper outlining a thought experiment to suggest that the uncertainty principle requires the acknowledgement of an indeterminate past. More

FIRST EDITION of Feynman’s undergraduate thesis at MIT, “a fundamental discovery” published in The Physical Review when he was just twenty-one. More

FIRST EDITION of Murray Gell-Mann's Nobel-Prize winning work on the discovery of the "Eightfold Way" More