"Developed by Dr. Harold Edgerton in the 1940s, the Rapatronic photographic technique allowed very early times in a nuclear explosion’s fireball growth to be recorded on film. The exposures were often as short as 10 nanoseconds, and each Rapatronic camera would take exactly one photograph."
Intro with photos and another gallery from Simple Thinking, and a few more from Nevada Surveyor.
Via digg