| RefNo | PP/10/19 |
| Previous numbers | PP/42/19 |
| Level | File |
| Title | Paper, 'Note on induction coils or "transformers"' by John Hopkinson |
| Date | 1887 |
| Description | Hopkinson writes: 'The transformers considered are those having a continuous iron magnetic circuit of uniform section. Let A be area of section of the core, m and n the number of convolutions of the primary and secondary coils respectively, R, r, and ρ their resistances, ρ being the resistance of the secondary external to the transformer, x and y currents in the two coils, a induction per square centimetre, α the magnetic force, l the length of the magnetic circuit, E = B sin 2π (t/T), the difference of potentials between the extremities of the primary, T being the periodic time.'
Annotations in pencil and ink throughout. Includes three geometrical diagrams.
Subject: Physics
Received 17 February 1887. Read 10 March 1887.
A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Note on induction coils or "transformers"'. |
| Extent | 10p |
| 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.1887.0031 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA8063 | Hopkinson; John (1849 - 1898); electrical engineer | 1849 - 1898 |