| RefNo | AP/28/12 |
| Level | Item |
| Title | Unpublished letter, 'Description of a process for extracting the palladium which exists in combination with the gold obtained from the Gongo Soco and other mines in the Brazils' from Percival N [Norton] Johnson to the President of the Royal Society |
| Date | 11 March 1846 |
| Description | Johnson shares a process for the extraction of palladium from the Gongo Soco gold mine in Brazil. The process involves melting the gold, obtained from its matrix by the ordinary processes of stamping and washing, with three times its weight of silver, granulating it in cold water, and refining it by the process of quartation, or separation of its alloys by nitric acid. The nitric solution contains the silver, palladium, copper, and a small proportion of iron and lead.
Subject: Mining
Received 19 March 1846.
Written by Johnson at Mecklenburgh Square [London].
An abstract of the paper was published in volume 5 of Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society] as 'Description of a process for extracting the palladium which exists in combination with the gold of the gongosocho and other mines in the Brazils'. |
| Extent | 4p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| RelatedMaterial | DOI: 10.1098/rspl.1843.0087 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA5162 | Johnson; Percival Norton (1793 - 1866) | 1793 - 1866 |