| Reference number | PP/13/29 |
| Previous numbers | PP/45/32 |
| Level | File |
| Title | Paper, 'Electrical resistance of iron at a high temperature' by J [John] Hopkinson |
| Date | 1889 |
| Description | Hopkinson writes: 'Auerbach, Callendar, and I think also Tait, have observed that the temperature coefficient of electrical resistance of iron is abnormally high. So far as I know no one has pushed his observations to the temperature at which iron ceases to be magnetic. The accompanying curve [see PP/13/29/2] shows the results of experiments made upon a very soft iron wire. The abscissae are the temperatures as estimated by the resistance of a copper wire, the ordinates represent the resistance of the iron wire having unit resistance at 20 degrees Celsius.'
Annotations in pencil and ink. Includes a graph of experimental results.
Subject: Electricity / Metallurgy
Received 14 March 1889. Read 21 March 1889.
A version of this paper was published in volume 45 of the Proceedings of the Royal Society as 'Electrical resistance of iron at a high temperature'. |
| Extent | 2p |
| Format | Typescript |
| Diagram |
| Physical description | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| Access status | Open |
| Related material | DOI: 10.1098/rspl.1888.0116 |
Fellows associated with this archive
| Code | Name | Dates |
| NA8063 | Hopkinson; John (1849 - 1898) | 1849 - 1898 |