Homepage

Record

RefNoMS/119/2/54
LevelItem
TitleLetter from Charles James Buchanan Riddell, Woolwich to Humphrey Lloyd
Date4 April 1844
DescriptionRiddell informs Lloyd that he has followed Lloyd’s instructions closely regarding the new instrument with the exception of altering the graduations of the deflecting bar from tenths of inches to hundredths of a foot. This is easily changed if Lloyd would prefer, however Riddell suggests keeping this alteration as the decimals of a foot are more convenient with the calculator and with portable instruments.

Discussion regarding the instruction for absolute declination. Riddell expresses his confusion about how the line of collimation of the magnets is to be adjusted.

The instructions will be closed and set to print as soon Riddell hears from Lloyd.

Riddell has sent the printed specifications to Mr [Samuel] Jones and asked him to revise the list of prices, as Lloyd was not happy with the price of £35.

Discussion about additional work on the telescope.

Riddell notes the list of instruments has increased since he started compiling the instructions two years ago.

Riddell discusses the description of Lloyd’s new instrument, and thanks Lloyd.

Discussion on Lloyd’s comments regarding Riddell’s fixed observatory instructions. Riddell discusses the requirement of a separate set of instruments and alterations to the bifilar. Riddell’s instructions are to be used by officers and others engaged in surveys who know nothing about magnetism as a science or of the magnetical instruments, but if ordered to make observations could do so if provided with sufficiently detailed instructions. Riddell argues this is the reason to keep higher scientific matter out of the instructions.
Extent8p
FormatManuscript
PhysicalDescriptionInk on paper
AccessStatusOpen
Fellows associated with this archive
CodePersonNameDates
NA7327Riddell; Charles James Buchanan (1817 - 1903)1817 - 1903
NA8252Lloyd; Humphrey (1800 - 1881)1800 - 1881
Add to My Items
    Papers of Elsie Widdowson and Robert McCance

    Papers of Elsie Widdowson and Robert McCance

    Useful Links

    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.

    Papers of Howard Florey
    Papers of Howard Florey
    Referees’ Reports
    Referees’ Reports
    Botanical paintings by Jacob van Huysum and William Sartorius
    Botanical paintings by Jacob van Huysum and William Sartorius
    Photographs of British algae: cyanotype impressions
    Photographs of British algae: cyanotype impressions
    Browse Collections

    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