Manuscript, 'Magnetic properties of an impure nickel' by J [John] Hopkinson Hopkinson writes: 'The sample of nickel on which these experiments were made was supposed to be fairly pure when the experiments began. A subsequent analysis, however, showed its composition to be as follows :— The experiments comprise determinations of the curve of magnetisation at various temperatures, the magnetising force being increased, that is to say, they are confined to a determination of the ascending curve of magnetisation.' Annotations in pencil and ink. Includes 22 pages of graphs of experimental results. Subject: Metallurgy / Magnetism Received 9 June 1888 / 11 June 1888. Read 14 June 1888. A version of this paper was published in volume 44 of the Proceedings of the Royal Society as 'Magnetic properties of an impure nickel'. 1888