Part of the University of Pennsylvania Library, the Schoenberg Center for Electronic Text & Image offers a unique collection of chemistry related photographs. The pictures are in three categories and include scientist's portraits, apparatus images, and laboratory images. For example, a link to a 19th century pressure chamber brings up the photograph, information on the people in it, image information, and any other available facts. This very interesting collection can be browsed or searched by keyword and will easily take up several hours of your time.