| RefNo | MA/256/9 |
| Previous numbers | MA.260 |
| Level | File |
| Title | Magnetic observations made at Port Louis, Falkland Islands [?] visited by HMS Erebus, by [James Clark Ross?] |
| Creator | Ross; Sir James Clark (1800-1862); polar explorer |
| Date | 29 September-1 November 1842 |
| Description | Daily magnetic observations made at Port Louis, or on board ship, using a declination magnetometer, a bifilar magnetometer, and a vertical force magnetometer. The readings are plotted against Gottingen mean time, at [most often] hourly intervals. With thermometer readings and an end column with occasional weather observations, usually wind direction and force. On 4 October 1842, the instrument readings are taken at more regular intervals, the occupying pp.9-25 of the volume.
The volume gives no indication of the location of the observations, which must be inferred from earlier volumes in the series. |
| Extent | 738p. [pp.90-738 either blank or not used] |
| Format | Manuscript |
| PhysicalDescription | Full vellum binding. Typed paper label to top of spine: 'Met. Arch. 260'. Inner front board has an engraved paper label: 'Jones & Causton, Wholesale Stationers...47 Eastcheap, Fish Hill Street...'. |
| Dimensions | 370x250mm. |
| AccessStatus | Open |