Skip to content

Please be aware that some material may contain words, descriptions or illustrations which will not reflect current scientific understanding and may be considered in today's context inaccurate, unethical, offensive or distressing.


Hopkinson writes: 'Several alloys have been examined, supplied to me very kindly by Mr Riley, of the Steel Company of Scotland. I confine myself to a brief statement of the results with the most interesting sample. Mr Riley informs me that this sample contains 25 per cent. of nickel. As the material was given to me it was non-magnetic at ordinary temperature, that is to say, the permeability was small, about 1.4, and the induction was precisely proportional to the magnetising force. The ring on being heated remained non-magnetic up to 700°C. or 800°C. A block of the material did not recalesce on being heated to a high temperature and being allowed to cool. On being placed in a freezing mixture the material became magnetic at a temperature a little below freezing point.'

Annotations in pencil and ink. Includes two pages of graphs of experimental results.

Subject: Magnetism / Metallurgy

Received 2 December 1889. Read 12 December 1889.

A version of this paper was published in volume 47 of the Proceedings of the Royal Society as 'Magnetic properties of alloys of nickel and iron'.

Reference number
Earliest possible date
Physical description
Ink and graphite pencil on paper
Page extent
4 pages

Creator name

John Hopkinson

View page for John Hopkinson

Use this record


John Hopkinson, Paper, 'Magnetic properties of alloys of nickel and iron' by J [John] Hopkinson, 1889, PP/15/4, The Royal Society Archives, London,, accessed on 14 June 2024

Link to this record

Embed this record

<iframe src="" title="Paper, 'Magnetic properties of alloys of nickel and iron' by J [John] Hopkinson" allow="fullscreen" frameborder="0" width="100%" height="500px"></iframe>

Related Publications

Related Records


This item is part of:

Related Fellows

Explore the collection

  • Proceedings Papers

    Dates: 1882 - 1894

    The archival collection known as 'Proceedings Papers' is comprised of manuscripts and occasional proofs of scientific papers sent to the Royal Society which were read before meetings of Fellows and printed in full in the Proceedings of the Royal Society.

    View collection