Reference numberMS/119/2/135
TitleLetter from John Allan Broun, Makerstoun, Kelso to Humphrey Lloyd
Date26 October 1846
DescriptionDiscussion on observations made by Broun using the bifilar magnet [at the Makerstoun Magnetic Observatory]. Broun describes the method in which he obtained results, using marble slabs, and wooden blocks, causing lines to be drawn at various distances. Includes small drawing of a rectangular block of wood which was made to carry the deflecting magnet so that the curve would be at the same height as the bifilar magnet. Broun describes lines drawn on the blocks at different angles. Discussion on results made for the balance needle and values of q. Discussion on the temperature coefficient and the difficulties this is causing to the unit coefficient for the bifilar magnet. Broun comments on the differences between his results and Lloyd's.
Physical descriptionInk on paper
Access statusOpen
Fellows associated with this archive
NA3813Broun; John Allan (1817 - 1879)1817 - 1879
NA8252Lloyd; Humphrey (1800 - 1881)1800 - 1881
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