Details of exhibit
- Exhibition:
- 1907 Fifty-second Annual Exhibition of the Royal Photographic Society of Great Britain
- Exhibit title:
- Photographs of the Sun
- Exhibitor:
- P. H. Cowell
- Section:
- Scientific and Technical Photography and its Application to Processes of Reproduction
- Group Title:
- 514 to 517. Transparencies - Frame II
- Exhibit No.:
- [515]
- Exhibit No. 2:
- [1]
- Description:
- Taken with the Thompson Photoheliograph, of 9 inches aperture, and 9 feet focal length. In use, the aperture is stopped down to 4 inches, and a positive magnifier is employed, giving an image of the sun about 7½ inches in diameter on the photographic plate. A and C are positive copies on glass the same size as the original negatives, and show the entire disc of the sun. B is a positive enlargement on glass, four times the scale of the original, and shows only the central portion of the disc.
A taken 1906, July 31d. 15h. 53m. 11s. G.C.T.
B taken 1905, July 15d 15h. 33m. 20s. G.C.T.
C taken 1905, July 14d. 15h. 46m. 38s. G.C.T. - Exhibit type:
- Photograph
- Process:
- [Not Listed] ()
- Award:
- none
