A leaf photographed by William Henry Fox Talbot, c. 1839. William Henry Fox Talbot (1800-77) developed a photographic system for making prints on silver chloride paper in 1839, the same year as the invention of the daguerreotype. In 1842, he patented the first type of negative (calotype) from which prints could be made. He was consequently awarded the Royal Society's Rumford Medal. He also developed a method for making instantaneous photographs using electric spark illumination, in 1851. His Pencil of Nature (1844) was the first book to be illustrated with photographs. He also published works on astronomy and mathematics.