An extensive collection of some 30,000 historical digital images, photographs, slides, lithographs, engravings, drawings and other visual materials relating to the history of physics and its allied sciences. The collection focuses on modern American physicists, astronomers and geophysicists, but includes many scientists in Europe and elsewhere, in other fields related to physics, and in earlier times. It contains photos and illustrations of industrial laboratories, meetings of scientific societies, academic physics departments, observatories, apparatus, telescopes, accelerators and other instruments, objects and places.