| RefNo | HS/18/15 |
| Level | Item |
| Title | Letter, from James Thomas Walker to Sir John Herschel, dated at 1 Cromwell Road, South Kensington |
| Creator | James Thomas Walker |
| Recipient | John Frederick William Herschel |
| Date | 9 December 1864 |
| Description | Autograph letter signed by sender. Sent John Frederick William Herschel 'Index Chart' of Great Trigonometrical Survey of India. Compares five triangulation methods: longitudinal series, George Everest's, G. B. Airy's, that of John Frederick William Herschel's son John, and minimum squares. John Frederick William Herschel's son and bride avoided cyclone that destroyed Calcutta Observatory. |
| Language | English |
| Extent | 4pp |
| Format | Manuscript |
| Place origin | 1 Cromwell Road, South Kensington |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| URLDescription | Also available on Epsilon |
| URL | https://epsilon.ac.uk/view/herschel/letters/Herschel7807
|
Fellows associated with this archive
| Code | PersonName | Dates |
| NA6271 | Walker; James Thomas (1826 - 1896) | 1826 - 1896 |
| NA8238 | Herschel; Sir; John Frederick William (1792 - 1871); mathematician and astronomer | 1792 - 1871 |