| Reference number | MC/20/316 |
| Alternative reference number | MC.05316 |
| Level | Item |
| Title | Letter from [?], to the Royal Society |
| Date | [June 1905] |
| Description | Sends in a brief outline of a 'study' on magnetic variation called the 'Earth's Swing' [enclosure not present]. |
| Extent | 3p |
| Format | Manuscript |
| Physical description | Ink on paper |
| Access status | Open |