| Reference number | LBO/3/94 |
| Alternative reference number | LBO/3/196 |
| Level | File |
| Title | Copy extract from a letter by Francis Vernon to Henry Oldenburg |
| Date | 30 October 1669 |
| Description | ' Concerning Signor Cassini's present employment, as also the effects of an extraordinary burning concave. ' |
| Extent | 34p |
| Format | Manuscript |
| Access status | Open |