Portrait of a Boy, circa 1854

The daguerreotype, popular in the early 1840s-late 1850s, was the first form of photography available to the public. Sheets of silver-plated copper--polished to a mirror finish--were bathed in photosensitive vapors, and exposed in cameras. In formal studios and traveling booths, photographers created affordable portraits. For the first time, people saw their likenesses--fixed permanently in time and place.