| Reference number | AP/13/13/4 |
| Level | Item |
| Title | Unpublished diagram, variation of compass by John Macdonald |
| Date | 10 March 1828 |
| Description | Diagram illustrating the variation of the compass in relation to the meridian of London and the meridian of the northwest pole.
Subject: Geodesy
Written by Macdonald in Summerlands, Exeter [Devon, England]. Communicated by Sir Humphry Davy. |
| Extent | 1p |
| Format | Diagram |
| Physical description | Ink on paper |
| Access status | Open |
| Related records in the catalogue | AP/13/13 |
Fellows associated with this archive
| Code | Name | Dates |
| NA8200 | Davy; Sir; Humphry (1778 - 1829); chemist | 1778 - 1829 |
| NA3036 | Macdonald; John (1759 - 1831) | 1759 - 1831 |