A contemporary letter by Talbot states that his January 1839 Royal Institution exhibit included "...various pictures, representing the architecture of my house in the country ... made with the Camera Obscura in the summer of 1835." A basis for naming this famous image as the oldest among the surviving camera negatives of similar date is not apparent.
Album of Photogenic Drawings (1839-1840) (in Italian : Album di disegni fotogenici) by William Henry Fox Talbot British & (likely) Sebastiano Tassinari (metmuseum.org)
Joanna Martin, 'Porter, (Ann) Agnes (c.1752–1814)', Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, May 2009 accessed 11 Aug 2017
patents.google.com
Talbot regarded the two names as interchangeable—see U.S. Patent 5171
