Details of exhibit
- Exhibition:
- 1909 Fifty-fourth Annual Exhibition of the Royal Photographic Society of Great Britain
- Exhibit title:
- Photomicrographs of an unequally illuminated slit which has been photographed on various plates
- Exhibitor:
- C. E. K. Mees
- Exhibitor 2:
- E. Kenneth Hunter
- Section:
- Scientific and Technical Photography and its Application to Processes of Reproduction
- Exhibit No.:
- 412
- Description:
- The photographs were taken in a large reducing camera furnished with a spectroscope slit, illuminated with a Nernst lamp. This slit was photographed from a distance of 14 feet by means of a small camera fitted with a spectroscopic objective and made of brass so as to maintain a constant focal plane. The slit was covered by a black wedge giving a variation of intensity from 1 to 60. The image of the slit was about ˝mm. long 1/40th mm. wide.
Owing to irradiation the image spreads out greatly at the end of greatest intensity, and this spread is seen to depend on the plate. It will be noted that coarser grain does not necessarily carry with it greater irradiation. - Exhibit type:
- Photographic equipment and supplies
- Process:
- [Not Listed] ()
- Award:
- none
