The men working on the Bevatron show the massive scale of this particle accelerator built at Lawrence Berkeley National Laboratory in 1954. The antiproton was discovered there in 1955, resulting in the 1959 Nobel Prize in physics for Emilio Segrè (APS 1963) and Owen Chamberlain. Stamped “Information Division, Radiation Laboratory, University of California, Berkeley,” these photos add to the Library’s growing collections in the history of science, technology, and medicine.