Kerst and Betatrons | University of Illinois Archives
Black and white photograph of Donald W. Kerst (1911-93) , professor of physics (1938-57), and developer of the betatron. The first betatron device rests on a table before him, while a then-new second betatron is visible in the background.
From the Public Information Office caption on the verso:
"Betatron developer Prof. D.W. Kerst, with first betatron, 2,000,000 electron volts power, beside new, second betatron, 20,000,000 volts power [sic]."
Found in RS 39/2/20, RES-2
Original print is 12.8 x 10.1 cm