Details of exhibit
- Exhibition:
- 1907 Fifty-second Annual Exhibition of the Royal Photographic Society of Great Britain
- Exhibit title:
- Four negatives illustrating the action of time upon the latent image
- Exhibitor:
- H. J. Channon
- Section:
- Scientific and Technical Photography and its Application to Processes of Reproduction
- Exhibit No.:
- 479 to 482
- Description:
- A number of Ilford Ordinary ¼-plates (purchased shortly before) were exposed in rapid succession under practically identical conditions on 28th June, 1894 – 4 seconds each with f/46 at 3 o’clock p.m., light remaining of quite constant brightness. One was developed a few days later (10th July, 1894), the others were carefully packed, film to film, well stored, and are being developed at intervals of four years, all the conditions of development being kept as nearly as possible exactly the same as in the case the first one developed. Pyro-ammonia of fixed proportions is being used at 67° temperature – the ammonia always tested by burette.
The negatives exhibited show the result obtained during twelve years.
These exhibits are in the base of the Lantern Stand in the North Room. - Exhibit type:
- Photograph
- Process:
- [Not Listed] ()
- Award:
- none
