William Henry Fox Talbot--a scientist, mathematician, author and artist--is credited with being the inventor of photography as we know it. In mid-1834 he began to experiment with light-sensitive chemistry, and in January 1839 he announced his invention of the photogenic drawing, two weeks after Louis-Jacques Mand? Daguerre's daguerreotype process debuted in France. Talbot's improved process, the calotype, was introduced in 1840. This invention, which...