Lancaster, PA: American Institute of Physics, 1933. First edition. FIRST EDITION IN ORIGINAL WRAPPERS OF ANDERSON’S DISCOVERY OF ONE OF THE TINIEST PARTICLES IN NATURE, THE POSITRON, A PART OF THE ATOM ALSO KNOWN AS THE POSITIVE ELECTRON.
To measure the energy of the electrons produced by cosmic rays, Anderson designed and constructed an apparatus that consisted of a large electromagnet hugging a Wilson cloud chamber, which he described, in a 1936 interview, as "nothing much but a sealed tube full of water vapor under very low pressure." He used an arc-lighted camera for photographing, through a window in the chamber, the visible vapor trails of charged particles moving through it. An electric field made the trails "curve beautifully," Anderson said in an interview after the prize was awarded. He said he and an assistant "knew that the paths should curve all in the same direction, for we believed that the particles were electrons -- units of electricity, carrying a negative electric charge."
But one night in 1932, he and his assistant "saw the track of a particle that was being bent in the opposite direction." Eventually, calculations showed that this positively charged particle was not like anything that had ever been found. Further analysis disclosed that it was what came to be called the positron. For this discovery, Carl Anderson received the 1936 Nobel Prize in Physics. Item #1510
CONDITION & DETAILS: Physical Review, 1933, Vol. 43, 6, pp. 491-94. Quarto. Anderson’s paper includes four photographic illustrations of cloud chambers. Individual issue in original wrappers, in good++++ condition except for the residue of three holes punched in the issue at some point. The punching did not succeed either on the front or back, but evidence of the attempt is present at the inner margin both inside and out. A barely visible (photo) blind stamp also appears at the foot of the front wrap. The rear wrap is toned at the edges. The otherwise bright and clean throughout.