2Beresford Hope, Alexander J.B. "Fourth Incorporating Resolution." Archaeologia Cantiana 1 (1858): xlv.
The first practical means of making photographs, the daguerreotype, was invented in France in 1838. About the same time a process of making photographic prints on paper, the calotype, was invented in England. The more advanced "wet collodian" process, better suited for field work, came into wide use after 1851.