Homepage

Record

RefNoPP/3/6
Previous numbersPP/35/6
LevelItem
TitlePaper, 'On the atomic weight of manganese' by James Dewar and Alexander Scott
Date1883
DescriptionDewar and Scott write: 'Our attention has been directed for some time to a new determination of the atomic weight of manganese. This communication gives a succinct account of the results of the preliminary stages of such an inquiry, and although the further progress of the investigation may reveal some errors, still we feel convinced the final numbers can in no way differ materially from the present values, and therefore further delay in publication is unnecessary. The atomic weight of manganese has been determined by many chemists, but the resulting values vary considerably according to the special method selected. The results of the different investigators may be divided into two classes—those giving approximately 55 as the number, and those making it about 54. To the former class belong Turner, Berzelius, and Dumas, all of whom use the same method, viz., the determination of the silver chloride yielded by a weighed amount of chloride of manganese. Turner also made determinations from the analysis of the carbonate, and from the conversion of the monoxide into sulphate. Von Hauer used the same method as that employed by him in the determination of the atomic weight of cadmium, viz., the reduction of manganous sulphate to sulphide by ignition in a current of sulphuretted hydrogen. It is probable that this method is not very trustworthy, as, according to Schneider, the sulphide may be contaminated by oxysulphide. Schneider and Rawack belong to the second class of observers, the former employing the oxalate, and from its analysis calculating the atomic weight by deducting the weight of water and carbon dioxide obtained. Rawack, whose experiments were conducted in Schneider’s laboratory, weighed the water obtained by reducing manganoso-manganic oxide to manganous oxide.'

Annotations in ink.

Subject: Chemistry

Received 9 February 1883. Read 15 February 1883.

A version of this paper was published in volume 35 of the Proceedings of the Royal Society as 'On the atomic weight of manganese'.
Extent8p
FormatManuscript
PhysicalDescriptionInk on paper
Digital imagesView item on Science in the Making
AccessStatusOpen
RelatedMaterialDOI: 10.1098/rspl.1883.0008
Fellows associated with this archive
CodePersonNameDates
NA5870Dewar; Sir; James (1842 - 1923)1842 - 1923
NA6427Scott; Alexander (1853 - 1947)1853 - 1947
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.

    Early Letters
    Early Letters
    Papers of Elsie Widdowson and Robert McCance
    Papers of Elsie Widdowson and Robert McCance
    Photographs of British algae: cyanotype impressions
    Photographs of British algae: cyanotype impressions
    Papers of Colin Pillinger
    Papers of Colin Pillinger
    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