Daguerreotype

On this date in 1829, French painter and physicist Louis Daguerre presented his photographic process to the French Academy of Sciences. The first actual photograph had been made a couple of years earlier by Joseph Nicéphore Niépce, but the quality wasn't very good and the plate had to be exposed for eight hours to capture the image. Daguerre worked with Niépce to develop a more practical method. He found that if he coated a copper plate with silver iodide, exposed it to light in the camera for 20 to 30 minutes, fumed it with mercury vapor, and then fixed it with a salt solution, he was able to capture a permanent image. He called the finished product a "daguerreotype." Many early photographers became ill, or even died, from mercury poisoning using this method. The daguerreotype was best suited for still objects, but people nonetheless lined up to have their portraits taken. This was not for the faint of heart: subjects had to sit in blazing sunlight for up to half an hour, trying not to blink, with their heads clamped in place to keep them still. It's not surprising that most of the early daguerreotype portraits feature grim, slightly desperate faces.

An early professional daguerreotype photographer remarked on people's reaction to their portraits: "People were afraid at first to look for any length of time at the pictures he produced. They were embarrassed by the clarity of these figures and believed that the little, tiny faces of the people in the pictures could see out at them, so amazing did the unaccustomed detail and the unaccustomed truth to nature of the first daguerreotypes appear to everyone."

-Writer's Almanac