| Reference number | MM/14/178 |
| Level | Item |
| Title | Letter from John Perry, 13 Brunswick Square, to Sir Alfred Ewing |
| Date | 13 December 1890 |
| Description | With some comments on hysteresis and on Ewing joining the Physical Society. |
| Extent | 2 sides |
| Format | Manuscript |
| Access status | Open |
Fellows associated with this archive
| Code | Name | Dates |
| NA8053 | Ewing; Sir; James Alfred (1855 - 1935); engineer and cryptographer | 1855 - 1935 |
| NA5509 | Perry; John (1850 - 1920); electrical engineer and mathematician | 1850 - 1920 |