Royal Photographic Society. Progress medal. Web-page listing people, who have received this award since 1878 ("Progress Medal - the Royal Photographic Society". Archived from the original on 2012-08-22. Retrieved 2013-04-19.): “Instituted in 1878, this medal is awarded in recognition of any invention, research, publication or other contribution which has resulted in an important advance in the scientific or technological development of photography or imaging in the widest sense. This award also carries with it an Honorary Fellowship of The Society. […] 1884 J M Eder […]”
Royal Photographic Society. Progress medal. Web-page listing people, who have received this award since 1878 ("Progress Medal - the Royal Photographic Society". Archived from the original on 2012-08-22. Retrieved 2013-04-19.): “Instituted in 1878, this medal is awarded in recognition of any invention, research, publication or other contribution which has resulted in an important advance in the scientific or technological development of photography or imaging in the widest sense. This award also carries with it an Honorary Fellowship of The Society. […] 1884 J M Eder […]”
