| RefNo | MA/253/19 |
| Previous numbers | MA.253 |
| Level | Item |
| Title | Memorandum on the horizontal force magnetometer in use at the Madras Observatory, India, by Samuel Owen Edgar Ludlow |
| Creator | Ludlow; Samuel Owen Edgar (d.1888); British army officer in India |
| Date | 15 January 1845 |
| Description | On adjustments to the instrument since 27 May 1842.
Headed 'Horizontal Force Magnetometer' and signed by S.O.E. Ludlow, as Superintendent of the Observatory. |
| Extent | 2p. [p.2 blank] |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| Dimensions | 386x235mm. |
| AccessStatus | Open |