Dr. Clark B. Millikan on ladder looking into Caltech wind tunnel while another man observes from below. Reported in "CALTECH TESTS WIND IN TUNNEL: Guggenheim Graduate Unit Trying Out Planes" Los Angeles Times, 21 Jul. 1929: A1.
Dr. Clark B. Millikan on ladder looking into Caltech wind tunnel while another man observes from below. Reported in "CALTECH TESTS WIND IN TUNNEL: Guggenheim Graduate Unit Trying Out Planes" Los Angeles Times, 21 Jul. 1929: A1.
Portion of a wind tunnel. There is a window on one of the tunnels and wooden ladders surrounding it. Reported in "CALTECH TESTS WIND IN TUNNEL: Guggenheim Graduate Unit Trying Out Planes," Los Angeles Times, 21 Jul. 1929: A1.