Paper, 'Magnetic properties of alloys of nickel and iron' by J [John] Hopkinson

Description

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

PP/15/4

Earliest possible date

1889

Physical description

Ink and graphite pencil on paper

Page extent

4 pages

Format

Manuscript
Diagram