Details of exhibit
- Exhibition:
- 1909 Fifty-fourth Annual Exhibition of the Royal Photographic Society of Great Britain
- Exhibit title:
- The photomicrographs of screen plates at x 150 magnifications
- Exhibitor:
- J. H. Pledge
- Section:
- Scientific and Technical Photography and its Application to Processes of Reproduction
- Exhibit No.:
- 418
- Description:
- Illuminant used: - An oil lamp fitted with a compensating screen reducing it to equivalent of daylight and a further correcting screen giving, on the panchromatic plate employed, orthochromatic rendering of the coloured elements of the screen plates.
The following is the order of visual brightness: -
Joly taking, G. R. B., green narrowest.
Joly viewing, G. B. R., green narrowest.
Macdonough, G. B. R., blue narrowest.
Krayn Line, G. R. B., red narrowest; green and blue equal.
Krayn mosaic, G. B. R.
Warner & Powrie, B. G. R., early experimental screen. Two narrowest lines blue.
Autochrome, R. G. B., red and green nearly equal.
Thames, G. R. B., interspace blue.
Aurora, G. R. B.
Omnicolore, G. R. B., continuous line blue; large square green; small square red. - Exhibit type:
- Photographic equipment and supplies
- Process:
- [Not Listed] ()
- Award:
- none
