| RefNo | RBO/21/51 |
| AltRefNo | RBO.21.285 |
| Level | Item |
| Title | 'A new method of improving and perfecting Catadioptrical Telescopes by forming the Speculums of Glass instead of Metal by Mr Caleb Smith' |
| Date | 1739 |
| Description | Read to the Royal Society on 5 April 1739 |
| Language | English |
| Extent | 14 sides |
| Format | Manuscript |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |