| Reference number | HS/6/2 |
| Level | Item |
| Title | Letter, from John Henry Dallmeyer to Sir John Herschel, dated at 19 Bloomsbury St. |
| Creator | Dallmeyer; John David (1830-1883); Anglo-German optician |
| Date | 24 September 1866 |
| Description | Autograph letter signed by sender. Outlining phenomena in the refraction of light. Has been experimenting with wide angle lenses for cameras and gives some of their defects. Would like John Frederick William Herschel's opinion on how to get rid of the 'secondary focus.' |
| Language | English |
| Extent | 12pp |
| Format | Manuscript |
| Place origin | 19 Bloomsbury St., London |
| Origin coordinates | 51.51764, -0.12745 |
| Digital images | View item on Science in the Making |
| Access status | Open |
| URL description | Also available on Epsilon |
| URL | https://epsilon.ac.uk/view/herschel/letters/Herschel6683
|
Fellows associated with this archive
| Code | Name | Dates |
| NA8238 | Herschel; Sir; John Frederick William (1792 - 1871); astronomer | 1792 - 1871 |