Reference numberMS/119/2/18
TitleLetter from Humphrey Lloyd, Trinity Colleg, Dublin to Charles James Buchanan Riddell, Magnetic Observatory Toronto
Date14 November 1840
DescriptionLloyd is replying to Riddell's two letters from 27th July and 27th August. Lloyd informs Riddell he has just returned from his 'continental' tour. Discussion on the equilibrium of Riddell's magnets. Discussion on the observations of the horizontal force, the vertical force and changes to the coefficient. Discussion on the strength of the magnets in Riddell's possession. Lloyd suggests not to remagnetise the magnets of fair strength, and how to get a good deflection form the weaker magnet. Lloyd praises Riddell's idea of observing the temperature corrections of the vertical force. Discussion on the August term day. Lloyd informs Riddell of sending another letter through Edward Sabine regarding six months returns.
Physical descriptionInk on paper.

The letter has two holes where presumably the wax seal has been broken. The wax seal has been removed.
Access statusOpen
Fellows associated with this archive
NA8252Lloyd; Humphrey (1800 - 1881)1800 - 1881
NA7327Riddell; Charles James Buchanan (1817 - 1903)1817 - 1903
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