Authorised form of nameMagellan; John Hyacinth de (1722 - 1790)
Other forms of nameMagalhaens, John Hyacinth de; Magalhaens, Jean Hyacinthe de; Magellan, Jean Hyacinthe de; Magalhaes, Joao Jacinto de; de Magellan, John Hyacinthe
ForenamesJohn Hyacinth de
Dates1722 - 1790
Dates and placesBirth:
Lisbon, Portugal (04 November 1722)
12 Nevils Court, Fetter Lane, Lomdon (07 February 1790)
Islington churchyard, London
ActivityResearch Field:
Physics, Mathematics
Placed in the Augustinian monastery of Santa Cruz, Coimbra (aged 11); left the monastery to undertake a 'philosophical tour' of Europe (1758); forced to return to Portugal to answer certain allegations; trapped by the war (for 7 years), but left as soon as he was able on bad terms and never returned to Portugal; worked as a Tutor; went to England (1766); published a book on reflecting instruments (1775); conducted scientific correspondence with acquaintances throughout Europe; made improvements to various instruments for observation, including the 'Magelloscope';
Royal Society activityMembership:
Election Date:
RelationshipsDescendent of Ferdinando Magalhaens, discoverer and namesake of the Magellan Straits
Bulloch's Roll; DNB
Stephen F Mason, 'Jean Hyacinthe de Magellan, FRS, and the Chemical Revolution of the Eighteenth Century' in NR 1991 vol 45 pp 155-164
M Crosland, 'Relationships between the Royal Society and the Academie des Sciences in the late eighteenth century' in NR 2005 vol 59 pp 25-34
DNB states that he might have been born in a place called Talavera.
Royal Society codeNA8072
Archives associated with this Fellow
Reference numberTitleDate
EC/1774/01Magalhaens, John Hyacinth de: certificate of election to the Royal Society
MM/3/17Letter from John Hyacinth Magellan, London, to the Royal Society23 March 1778
MM/1/34Copy of a Resolution from twelve Fellows of the Royal Society, recommending the reinstatement of Dr Charles Hutton as Foreign Secretary29 January 1784
MM/3/16Letter from John Hyacinth Magellan, London, to the Royal Society22 January 1778
MM/1/35Copy of a Resolution from Nine Fellows of the Royal Society, deprecating Presidential influence in the election of Fellowsc.1784
AP/5/21Memoire sur le Saltpetre Concernant Les principes Generaux pour la formation des Netrieres Artificielles
RSL/1/32Copy of a note received from Mr Mechain, relative to his Calculation of the Elements of Herschel's planet, and sent by Chevalier de Bory to Mr de Magellan1783
MS/391/160Bond of John Hyacinth de Magellan to the Treasurer of the Royal Society21 April 1774
L&P/4/292Letter, 'Accompanying a case of Roman medals' from Jean Hyacinthe de Magellan to Edward Mendez da Costa9 January 1766
L&P/4/329Letter, 'Of the second comet of 1766 - ephemeris calculates for May and June' from Jean Hyacinthe de Magellan and Charles Messier to Matthew Maty12 May 1766
L&P/4/288Paper, 'A new baro-thermometer' by Jean Hyacinthe de Magellan6 June 1765
L&P/7/84Letter, 'Some new observations by Messier on the Comet' from John Hyacinth de Magellan to Joseph Banks29 January 1779
L&P/4/288/2Plate, unnamed [Parts of baro-thermometer] by Jean Hyacinthe de Magellan1765
L&P/4/288/3Plate, unnamed [Parts of baro-thermometer] by Jean Hyacinthe de Magellan1765
L&P/5/278Letter, 'Celestial phenomena' from John Hyacinth de Magellan to Matthew Maty14 November 1771
L&P/5/204Letter, 'Of the Abbe Chappe's observations on the transits and of his death' from Charles Messier to John Hyacinth de Magellan1770
L&P/5/323Paper, 'A new construction of the sea-quandrant' by John Hyacinth de Magellan1772
L&P/7/94Letter, 'Discovery of quinquina shrubs at Santa Fe' from Casimire Gomez de Ortega to John Hyacinth de Magellan2 December 1778
L&P/6/246Letter, 'Of an aurora borealis' from Jean Castilllon to John Hyacinth de Magellan11 March 1777
L&P/6/175Letter, 'Of phosphorus' from Giambattista Beccaria to John Hyacinth de Magellan29 February 1776
L&P/6/213Letter, 'Account of a portrait of Copernicus presented by him to the Society' from Nathaniel Matthew Wolf to John Hyacinth de Magellan7 April 1776
L&P/6/236Letter, 'Astronomical observations' from Nathaniel Matthew Wolf to John Hyacinth de Magellan7 April 1776
L&P/7/80Paper, 'Account of an iconantidiptic telescope invented by M Jouriat' by John Hyacinth de Magellan1779
L&P/8/45Letter, 'On the discovery of a comet' from Edward Pigott to John Hyacinth de Magellan22 November 1783
L&P/9/18Letter, 'Observations of the transit of Mercury at St Petersburg, 1786' from Stephanus Rumovski to John Hyacinth de Magellan1786
RSL/1/31'Extract of a letter from Monsieur Mechain, a member of the Royal Academy of Sciences at Paris, to Mr de Magellan, dated the 25 February 1783 on the element or orbit of the new planet discovered by Mr Herschel FRS and on the late transit of Mercury with some observations of the best [ ] of the Pleiades'1783
IM/005901Magalhaens, John Hyacinth de2001
Add to My Items

    Collection highlights

    Browse the records of some of our collections, which cover all branches of science and date from the 12th century onwards. These include the published works of Fellows of the Royal Society, personal papers of eminent scientists, letters and manuscripts sent to the Society or presented at meetings, and administrative records documenting the Society's activities since our foundation in 1660.

    The Royal Society

    The Royal Society is a Fellowship of many of
    the world's most eminent scientists and is the
    oldest scientific academy in continuous existence.
    Registered charity number 207043

    Website design ©CalmView


    + 44 207 451 2500
    (Lines open Mon-Fri, 9:00-17:00. Excludes bank holidays)

    6-9 Carlton House Terrace, London SW1Y 5AG

    Email Us →


    Subscribe to our newsletters to be updated with the
    latest news on innovation, events, articles and reports.

    Subscribe →

    © CalmView