| RefNo | NLB/20/562 | 
| AltRefNo | NLB/20 p350 | 
| Level | Item | 
| Title | Copy letter from Robert William Frederick Harrison, to Dr David Gill, William Henry Mahoney Christie, and Sir C Wilson | 
| Date | 21 May 1900 | 
| Description | 'Geodetic Arc_______, which has been appointed by the Council to prepare for presentation to the International Association of Academies, a Memorandum upon the question of the extension of the Geodetic Arc along the 30th Meridian'. | 
| Extent | 1p | 
| Format | Carbon | 
| PhysicalDescription | Manuscript | 
| AccessStatus | Open | 
Fellows associated with this archive
| Code | PersonName | Dates | 
| NA6998 | Christie; Sir; William Henry Mahoney (1845 - 1922) | 1845 - 1922 | 
| NA6654 | Gill; Sir; David (1843 - 1914); astronomer | 1843 - 1914 |