| RefNo | DM/4/25 |
| Level | Item |
| Title | Letter from Nevil Maskelyne, Geenwich, to General William Roy |
| Date | 1 November 1789 |
| Description | Maskelyne has no objection to use being made of his method of computing spherical triangles.
Mention is also made of 'Mayer's treatise on refraction'. |
| Extent | 2 sides |
| Format | Manuscript |
| AccessStatus | Open |
| AccessConditions | OPEN - but photocopying forbidden. |