| RefNo | MS/119/2/93 |
| Level | Item |
| Title | Report on magnet observations by John Henry Lefroy |
| Date | 1 April 1841 |
| Description | [Report on magnet observations made from the observatory at Longwood St Helena]. Discussion on the balance of the dipping needles. Lefroy notes he has not received short focus lens, correction of temperature, equation used to make observation, discussion on the vertical force. Lefroy documents on adjustments to the horizontal force in order to bring back the mean point; effects of radiation from the sun on results. |
| Extent | 4p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA7669 | Lefroy; Sir; John Henry (1817 - 1890) | 1817 - 1890 |