Dr. George A. Kolstad, Yale University physicist, tests for the presence of radio frequency on the new atom-smashing proton accelerator he designed and built. The machine fires gamma rays or high-energy X-Rays, and the results can be watched directly. Compared with other atom-smashers, it's something like giving a soldier a machine gun instead of a rifle.

Photo is dated 1948.

Photo measures 7 x 9 inches.