Scientists Lieutenant-Colonel L. M. (Lewis Milton) Adams and Captain H. R. Zimmer testing Radium Atomite at Caltech. Photo appears with the article, "Radium-Atomite Tried Out: Tests at Caltech Expected to Result in Use of Local Invention in Warfare," Los Angeles Times, 26 May 1928: A3.
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.