Research materials, laboratory notebooks, correspondence, autobiographical materials, audio and video recordings of Harold E. Edgerton, professor of electrical engineering at the Massachusetts Institute of Technology from 1928 to 1966, Institute Professor from 1966 to 1968, and Institute Professor Emeritus from 1968 to 1990. Edgerton perfected the stroboscope and developed photographic techniques that allowed very rapid events to be observed and captured on film. He also developed techniques for underwater exploration, using sonar devices and flash photography, and participated in many oceanographic and archaeological expeditions.