Sir John Herschel took this earliest known photograph of a telescope, a 40-inch device owned by his father, Sir William Herschel, in September 1839. Both father and son were famous astronomers. Sir John Herschel named the new medium for creating permanent images of the world using lenses "photography."
May 25, 2012 6:00 AM PDT
Photo by: Courtesy Oxford Museum of the History of Science