| RefNo | HS/10/153 | 
| Level | Item | 
| Title | Letter, from Wilhelm Hansen to Sir John Herschel, dated at Pentonville | 
| Creator | Hansen; Wilhelm (1832–1906); German mechanical engineer | 
| Recipient | John Frederick William Herschel | 
| Date | 15 May 1854 | 
| Description | Autograph letter signed by sender. Has been commissioned by Guillaume Weber to present a paper about an instrument for measuring the earth's magnetism, to John Frederick William Herschel. Would like to present it personally; when can he call? | 
| Language | English | 
| Extent | 1p | 
| Format | Manuscript | 
| Place origin | Pentonville | 
| Digital images | View item on Science in the Making | 
| AccessStatus | Open | 
| URLDescription | Also available on Epsilon | 
| URL | https://epsilon.ac.uk/view/herschel/letters/Herschel10799 | 
Fellows associated with this archive
| Code | PersonName | Dates | 
| NA8238 | Herschel; Sir; John Frederick William (1792 - 1871); mathematician and astronomer | 1792 - 1871 |