| Reference number | AP/64/5 |
| Level | File |
| Title | Unpublished paper, 'Star photography - the effects of long and short exposures on star magnitudes' by Isaac Roberts |
| Date | 1886 |
| Description | Roberts notices differences between the duplicate photographic plates in his star chart for the Northern Hemisphere, for which he suggests three possible causes: the duration of exposure; the varying sensitivity of the film; and the hygrometric states of the atmosphere. In this paper he focuses on the differences caused by various exposures.
Annotations in pencil and ink throughout. With two photographs titled 'Star Photography: Polaris and Trapezium Orion'.
Subject: Astronomy / Photography
Received 21 May 1886. |
| Extent | 18p |
| Format | Manuscript |
| Photograph |
| Physical description | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| Access status | Open |
| Related records in the catalogue | AP/66/26 |
Fellows associated with this archive
| Code | Name | Dates |
| NA7133 | Roberts; Isaac (1829 - 1904) | 1829 - 1904 |