Photographic print, enlarged copy, showing a 63 million volt positron passing through a 6 mm. lead plate and emerging as a 23 million volt positron (black-and-white print - photograph)
Photographic print, showing a 63 million volt positron passing through a 6 mm. lead plate and emerging as a 23 million volt positron (black-and-white print - photograph)
Black and white photographic print showing a disintegration produced in a lead plate by cosmic rays. One of the particles ionises heavily, taken on Pike's Peak (black-and-white print - photograph; stereograph)
