Paper, 'On effects of retentiveness in the magnetisation of iron and steel (Preliminary notice)' by J A [John Alfred] Ewing

Description

Ewing writes: 'The term Hysteresis was introduced in a paper, recently communicated to the Royal Society, to designate a peculiar action which was observed in the inquiry then recorded, and which had also presented itself in an earlier investigation—of the effects of stress on thermoelectric quality. It was found that when a stretched iron wire was gradually loaded and unloaded the changes of thermoelectric quality lagged behind the changes of stress, so that curves exhibiting the relation of stress to thermoelectric quality during the putting on and taking off of the load were far from coincident, but inclosed between them a wide area. In prosecuting those experiments it occurred to me that there is much room for investigation of hysteresis in the changes of magnetisation of iron and other substances produced by (1) change of the magnetic field; (2) change of stress; (3) change of temperature. In (2) and (3) two cases are to be considered :—First, when the substance is exposed to a constant magnetising force; second, when the magnetisation which is changed is wholly residual.'

Annotations in pencil and ink throughout. Includes four pages of graphs relating to experimental results. Followed by a note from William Thomson.

Subject: Magnetism

Received 6 May 1882. Read 25 May 1882. Communicated by Thomson.

Written by Ewing in Tokyo.

A version of this paper was published in volume 34 of the Proceedings of the Royal Society as 'On effects of retentiveness in the magnetisation of iron and steel. (preliminary notice.)'.

Reference number

PP/2/7

Earliest possible date

07 March 1882

Physical description

Ink and graphite pencil on paper

Page extent

17 pages

Format

Manuscript
Diagram