| RefNo | PP/14/22 |
| Previous numbers | PP/46/23 |
| Level | File |
| Title | Paper, 'On time lag in the magnetisation of iron' by J A [James Alfred] Ewing |
| Date | 1889 |
| Description | Ewing writes: 'When any change is made to take place in the magnetic force acting on a piece of soft (annealed) iron, a considerable time elapses before the resulting change in the magnetism of the piece is complete. The sluggishness which soft iron exhibits in assuming its full magnetism when a magnetic force is imposed upon it was referred to as follows in the account which I wrote, some years ago, of experiments on the magnetic qualities of iron:— “Some evidence was given that, in addition to much static hysteresis, there is a small amount of viscous lagging in the changes of magnetism which follow changes of magnetising force.'
Annotations in pencil and ink throughout. Includes seven pages of graphs of experimental results.
Subject: Magnetism / Metallurgy
Received 18 June 1889. Read 20 June 1889.
A version of this paper was published in volume 46 of the Proceedings of the Royal Society as 'On time-lag in the magnetisation of iron'. |
| Extent | 29p |
| Format | Manuscript |
| Diagram |
| PhysicalDescription | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| RelatedMaterial | DOI: 10.1098/rspl.1889.0033 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA8053 | Ewing; Sir; James Alfred (1855 - 1935); engineer and cryptographer | 1855 - 1935 |