Record

Reference numberMS/119/2/56
LevelItem
TitleLetter from Charles James Buchanan Riddell, Woolwich to Humphrey Lloyd
Date4 October 1844
DescriptionRiddell is sending Lloyd, [Henry] Lefroy’s northern observations, and would be thankful if Lloyd could particularly look over those relating to the induction inclinometer. Riddell lists the observations that he has sent. Observations included are of the declination bifilar and induction inclinometer at Fort Simpson, Mackenzie, term day observations, report of adjustments at Athabasca and Fort Simpson, and disturbances. Discussion on the induction inclinometer, and its construction which made the iron bar close to the magnet than usual.

Riddell discusses his observations from October 1843, and the increase in permanent magnetism.

Discussion on the first connected services of inclinometer observations.

The two bar instruments have been sent to all of their stations. Riddell recommends changes to instruments of low latitude in future use.

Riddell asks Lloyd to look over his paper and instructions regarding temperature corrections.

Riddell met with [Johann von] Lamont recently at Woolwich and recounts the points that struck him. Riddell describes Lamont observing the declination and intensity with an extremely compact portable instrument.

Discussion on the Toronto volume, and delays on printing.
Extent8p
FormatManuscript
Physical descriptionInk on paper
Access statusOpen
Fellows associated with this archive
CodeNameDates
NA7327Riddell; Charles James Buchanan (1817 - 1903)1817 - 1903
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