Photographic print, showing a 63 million volt positron passing through a 6 mm. lead plate and emerging as a 23 million volt positron
1932-1937
Two photographs, original and enlarged copy, showing a 63 million volt positron passing through a 6 mm. lead plate and emerging as a 23 million volt positron (pioneer photograph taken on 2nd August, 1932)
1932-1937
1932-1937