| Reference number | MOB/022 |
| Alternative reference number | 1932-459 |
| Level | Item |
| Title | Speculum by John Hadley |
| Date | c.1720s |
| Description | A speculum mirror for a Newtonian reflector, with skewed handle for holding and five small wooden eyepieces (lenses missing in four out of five). In a custom made wooden carry case. Speculum created by John Hadley, carry case created by the Science Museum. |
| Extent | 1 instrument, 7 parts |
| Format | Scientific Instrument |
| Materials | Metal, wood |
| Notes | On loan to the Science Museum 1932- 2019; SM inventory number '1932-459' |
| Access status | Open |
| Provenance | Exact provenance unknown. Mirror and telescope apparatus first shown to the Royal Society in 1721 and likely presented to the Society at a subsequent date by Hadley himself. |
| Related material | Written about at length in John Hadley's paper, 'An account of a catadioptrick telescope [...]', Philosophical Transactions of the Royal Society, vol. 32, no. 376 (1723) |
| URL description | Digital version available on The Royal Society Picture Library |
| URL | https://pictures.royalsociety.org/image-rs-18184 |
| https://pictures.royalsociety.org/image-rs-18185 |
| https://pictures.royalsociety.org/image-rs-18183 |
Fellows associated with this archive
| Code | Name | Dates |
| NA7954 | Hadley; John (1682 - 1744) | 1682 - 1744 |