An image of an inventor, captured with his own invention:
Louis Daguerre, a pioneer in photographic chemistry, would have been 224 years old today.
Not as though he would have lived anywhere near that long. His daguerreotypes involved curing silver iodine films with heated mercury vapor, a technique not for those squeamish about heavy metal poisoning. The daguerreotype became the first truly widespread method for permanently fixing a projected image.