Authorised form of nameHadley; John (1682 - 1744)
Dates1682 - 1744
Dates and placesBirth:
Hertfordshire, England (16 April 1682)
14 February 1744
East Barnet churchyard, Hertfordshire
Scientific instrument maker
Lincoln's Inn (admitted 1699)
Improved the reflecting telescope and invented the reflecting quadrant; worked with Francis Hauksbee, Clerk to the Royal Society, in improving telescopes
Royal Society activityMembership:
Election Date:
1720, 1722, 1724, 1726-1730; VP 1728- , 1734- , 1741-
RelationshipsSon 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)
Bulloch's Roll; DNB; DSB; LI; Thomas; Clifton
'Gentleman's Magazine' 1744, p108
Proposed by Sir Hans Sloane
Royal Society codeNA7954
Archives associated with this Fellow
Reference numberTitleDate
RBO/17/72Description of a new instrument for taking angles by John Hadley1731
EL/H4/30John Hadley to John Machin21 May 1736
RBO/11/30'Observations on the Satellites of Jupiter and Saturn made with a reflecting Telescope' by John Hadley1721
EL/H4/24John Hadley to Cromwell Mortimer7 October 1731
RBO/19/7Proposition relating to the combination of transparent lenses with reflecting planes by John Hadley1734
RBO/14/49'An account of a Book intitled hespheri et Phorphori nova Phanomena etc Autore Francisco Bianchino' by John Hadley1729
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 Hadley1732
RBO/12/81'An Account of an Aurora Borealis' by John Hadley1726
RBO/11/78'An account of a Catadioptrick telescope made after the Invention of Sir Isaac Newton' by John HadleyFebruary 1723
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 Hadley1733
CLP/22ii/71Paper, Account of Dr [Joseph Privat de] Molieres' 'Lecons de physique et de mathematique etc [Physical and mathematical lessons etc]' by John Hadley18th century
IM/001828Hadley, John1996
CLP/2/16Paper, 'An account of a catadioptrick telescope made after the invention of Sir Isaac Newton' by John HadleyFebruary 1723
L&P/1/12Paper slip, concerning John Hadley by Cromwell Mortimer[1941]
CLP/2/21Paper 'A new instrument for taking angles' by John Hadley1731
CLP/22ii/34Paper, Account of Francis Bianchinus' 'Hesperi et Phosphori Nova Phaenomena... [New phenomena of Hesperus and Phosporus (Venus)] ' by John Hadley1730
CLP/8i/67Pepr, observations of Jupiter's satellites and Saturn's rings with reflecting telescope by John Hadley1721
CLP/8ii/44Paper, 'A spirit level to be fixed to a quadrant for taking a meridional altitude at sea when the horizon is not visible' by John Hadley1733
MOB/022Speculum by John Hadleyc.1720s
DM/5/102A list of benefactors to the Museum, to the value of £5 or upwards at one time c.1737
CLP/4i/73Paper, 'The same describ'd by John Hadley Esq' by John Hadley15 November 1726
CLP/2/38Paper, 'Proposition relating to the combination of transparent lens with reflecting planes' by John Hadley1734
CLP/2/16/1Paper, 'An account of a catadioptrick telescope made after the invention of Sir Isaac Newton' by John HadleyFebruary 1723
CLP/2/16/2Plate, four figures showing the catadioptric telescope and Saturn by I Sturt[1723]
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