John Falconer, British Library
A Biographical Dictionary of 19th Century Photographers in South and South-East Asia
Joined Bengal Photographic Society Nov 1861.
In a letter to the Secretary of the Bengal Photographic Society, dated Peshawar, 4 January 1864, he writes of his experiments with alkaline film with the goal of shorter exposures:
‘Many experiments have been made with success. I have for some months past directed my attention in the same direction, and have succeeded in obtaining very fair stereo negatives on an exposure not exceeding 40 seconds by the dry process ... I have not had time to try experiments with other preservatives [other than tannin and honey], such as gum, gelatine, etc., but see no reason why these should not give similar assets where the fuming [with ammonia] is adopted.
- Λ Journal of the Bengal Photographic Society, vol. 1, no. 1, 1 May 1862.
- Λ JJournal of the Bengal Photographic Society, vol. 2, no. 7, March 1864, p. 77.