| Authorised form of name | Hadley; John (1682 - 1744) |
| Dates | 1682 - 1744 |
| Nationality | British |
| Place of birth | Hertfordshire, England |
| Date of birth | 16 April 1682 |
| Date of death | 14 February 1744 |
| DatesAndPlaces | Burial:
East Barnet churchyard, Hertfordshire |
| Occupation | Scientific instrument maker |
| Activity | Education:
Lincoln's Inn (admitted 1699)
Career:
Improved the reflecting telescope and invented the reflecting quadrant; worked with Francis Hauksbee, Clerk to the Royal Society, in improving telescopes
|
| Membership category | Fellow |
| Date of election | 21/03/1717 |
| RSActivity | Royal Society roles:
Council: 1720, 1722, 1724, 1726-1730; VP 1728- , 1734- , 1741- |
| Relationships | Son of George Hadley, of East Barnet, Hertfordshire, Deputy-Lieutenant and afterwards Sheriff of Hertfordshire, and his wife, Katharine FitzJames; married Elizabeth, daughter of Thomas Hodges (FRS 1715); uncle of John Hadley (FRS 1758) |
| Source | Sources:
Bulloch's Roll; DNB; DSB; LI; Thomas; Clifton
References:
'Gentleman's Magazine' 1744, p108
Notes:
Proposed by Sir Hans Sloane |
| Virtual International Authority File | http://viaf.org/viaf/7326235 |
| Code | NA7954 |
| RefNo | Title | Date |
| EL/H4/30 | Letter, from John Hadley to John Machin | 21 May 1736 |
| RBO/19/7 | Proposition relating to the combination of transparent lenses with reflecting planes by John Hadley | 1734 |
| RBO/12/81 | 'An Account of an Aurora Borealis' by John Hadley | 1726 |
| RBO/11/30 | 'Observations on the Satellites of Jupiter and Saturn made with a reflecting Telescope' by John Hadley | 1721 |
| IM/001828 | Hadley, John | 1996 |
| CLP/2/38/1 | Manuscript, 'A proposition relating to the combination of transparent lens's with reflecting planes' by J [John] Hadley | [1734] |
| CLP/2/38/4 | Diagram, axes and angles of refraction with speculum by [John Hadley] | [1734] |
| CLP/22ii/71 | Paper, Account of Dr [Joseph Privat de] Molieres' 'Lecons de physique et de mathematique etc [Physical and mathematical lessons etc]' by John Hadley | 18th century |
| CLP/2/38/3 | Diagram, axes and angles of refraction with speculum by [John Hadley] | [1734] |
| CLP/2/21/3 | Plate, base and overview of telescope by unknown artist | [1731] |
| DM/5/102 | A list of benefactors to the Museum, to the value of £5 or upwards at one time | c.1737 |
| L&P/1/12 | Paper slip, concerning John Hadley by Cromwell Mortimer | [1741] |
| RBO/18/30 | 'A further Account of an Instrument for taking Angles etc in a postscript to the Account of Observations made on board the Chatham' by John Hadley | 1732 |
| CLP/2/38/5 | Diagram, axes and angles of refraction of lenses with equal focal lengths by [John Hadley] | [1734] |
| CLP/2/21 | Paper, 'The description of a new instrument for taking angles' by John Hadley | [1731] |
| MOB/022 | Speculum by John Hadley | c.1720s |
| CLP/2/16/1 | Manuscript, 'An account of a catadioptrick telescope made after the invention of Sir Isaac Newton' by John Hadley | February 1723 |
| CLP/4i/73 | Paper, 'The same describ'd by John Hadley Esq' by John Hadley | 15 November 1726 |
| CLP/2/21/2 | Plate, specula and octant on telescope by unknown artist | [1731] |
| CLP/8i/67 | Paper, regarding observations of Jupiter's satellites and Saturn's rings with reflecting telescope by John Hadley | 1721 |
| EL/H4/24 | Letter, from John Hadley to Cromwell Mortimer | 7 October 1731 |
| CLP/2/21/1 | Manuscript, 'The description of a new instrument for taking angles' by John Hadley | [1731] |
| CLP/2/38/2 | Diagram, axes and angles of refraction by [John Hadley] | [1734] |
| CLP/2/16 | Paper, 'An account of a catadioptrick telescope made after the invention of Sir Isaac Newton' by John Hadley | February 1723 |
| CLP/22ii/34 | Paper, Account of Francis Bianchinus' 'Hesperi et Phosphori Nova Phaenomena... [New phenomena of Hesperus and Phosporus (Venus)] ' by John Hadley | 1730 |
| CLP/2/16/2 | Plate, four figures showing the catadioptric telescope and Saturn by I [John] Sturt | [1723] |
| CLP/2/38 | Paper, 'A proposition relating to the combination of transparent lens's with reflecting planes' by J [John] Hadley | [1734] |
| CLP/8ii/44 | Paper, 'A spirit level to be fixed to a quadrant for taking a meridional altitude at sea when the horizon is not visible' by John Hadley | 1733 |
| RBO/14/49 | 'An account of a Book intitled hespheri et Phorphori nova Phanomena etc Autore Francisco Bianchino' by John Hadley | 1729 |
| RBO/17/72 | Description of a new instrument for taking angles by John Hadley | 1731 |
| RBO/18/60 | 'Account of a Spirit Level to be fix'd to a Quadrant for taking a meridional Altitude at Sea when the Horizon is not visible' by John Hadley | 1733 |
| RBO/11/78 | 'An account of a Catadioptrick telescope made after the Invention of Sir Isaac Newton' by John Hadley | February 1723 |