Record

RefNoMS/119/2/100
LevelItem
TitleLetter from John Henry Lefroy, Toronto to Humphrey Lloyd
Date8 December 1846
DescriptionLefroy discusses the bifilar coefficient and inconsistencies between them. Lefroy sends a trace of the curves for July. Discussion on the law of changes of force shown by the small and large bifilar, Lefroy suggests running an independent test of the coefficients of force by vibrating a magnet at 10am and 5pm, as well as trying Mr Brown's method of obtaining the coefficients experimentally. Includes a table with quantities and corrected means of both the small and large bif for July 1846. Discussion on the curves monthly mean. Lefroy conveys the importance of establishing a self registering instrument, especially since there have been numerous aurora and disturbances this year. Lefroy mentions [Charles] Younghusband leaving Toronto and assisting Edward Sabine. Lefroy discusses his and his wifes journey, as well as other voyages to America that have not been successful.
Extent8p
FormatManuscript
PhysicalDescriptionInk on paper
AccessStatusOpen
Fellows associated with this archive
CodePersonNameDates
NA7669Lefroy; Sir; John Henry (1817 - 1890)1817 - 1890
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



    CONTACT US

    + 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

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

    Subscribe →

    © CalmView