Portrait of Nicolas Henneman, 1842. Photogr
© National Media Museum / Science & Society Picture Library
Portrait of Nicolas Henneman, 1842. Photograph taken by William Henry Fox Talbot (1800=1877). Fox Talbot invented the first negative/ positive proces for producing photographs between 1835-39. Any number of prints could be made from the same shot by transferring the negative image on to special paper to make a positive print; these prints were called calotypes.