Credit: Courtesy of American Memory
Eighth and Market Streets, Philadelphia, Sixth-plate daguerreotype, by Robert Cornelius, May 1840. "Philadelphia was one of the most "daguerreotyped" cities in the United States in the mid-nineteenth century. Made in the heart of the city's commercial district, this early street scene, photographed by Robert Cornelius, shows a laterally correct image, indicating that the daguerreotype was taken through a mirror or a reversing prism."
