| RefNo | PP/22/11 |
| Previous numbers | PP/54/12 |
| Level | Item |
| Title | Paper, 'On a failure of the law in photography that when the products of the intensity of the light acting and of the time of exposure are equal, equal amounts of chemical action will be produced' by William de Wiveleslie Abney |
| Date | 1893 |
| Description | Abney writes: 'It has been generally assumed that when the products of the intensity of light acting on a sensitive surface and the time of exposure are equal similar amounts of chemical action are produced, and with the ordinary exposures and intensities of light employed such, no doubt, is practically the case, and any methods of measurement hitherto practicable have been insufficiently delicate to discover any departure from this law, if such departure existed. In some recent experiments however, I have discovered that this law breaks down under certain conditions, and I think the fact worthy the attention of those interested in the subject, since it is possible that these conditions may arise with other experimenters.'
Annotations in pencil and ink.
Subject: Photography / Chemistry
Received 13 June 1893. Read 15 June 1893.
A version of this paper was published in volume 54 of the Proceedings of the Royal Society as 'On a failure of the law in photography that when the products of the intensity of the light acting and of the time of exposure are equal, equal amounts of chemical action will be produced'. |
| Extent | 9p |
| Format | Manuscript |
| PhysicalDescription | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| RelatedMaterial | DOI: 10.1098/rspl.1893.0060 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA6454 | Abney; Sir; William de Wiveleslie (1843 - 1920) | 1843 - 1920 |