In 1824 Niépce met with some degree of success in copying engravings, but it would be two years later before he had success utilizing pewter plates as the support medium for the process. By the summer of that year, 1826, Niépce was ready. In the window of his upper-story workroom at his Saint-Loup-de-Varennes country house, Le Gras, he set up a camera obscura, placed within it a polished pewter plate coated with bitumen of Judea (an asphalt derivative of petroleum), and uncapped the lens. After at least a day-long exposure of eight hours, the plate was removed and the latent image of the view from the window was rendered visible by washing it with a mixture of oil of lavender and white petroleum which dissolved away the parts of the bitumen which had not been hardened by light. The result was the permanent direct positive picture you see here -- a one-of-a-kind photograph on pewter. It renders a view of the outbuildings, courtyard, trees and landscape as seen from that upstairs window.
An ultimately doomed attempt to interest the Royal Society in his process -- which he called "Heliography" -- brought Niépce and the first photograph to England in 1827. Upon his return to France later that year, he left this precious artifact with his host, the British botanist and botanical artist, Francis Bauer, who dutifully recorded the inventor's name and additional information on the paper backing of the frame that held the unique plate.
The first photograph
Reproduction
