| RefNo | AP/32/4/2 |
| Level | Item |
| Title | Unpublished diagrams, the hydrostatic log by E L [Edward Lyon] Berthon |
| Creator | Berthon; Edward Lyon (1813-199); English inventor; clergyman |
| Date | December 1849 |
| Description | Four diagrams demonstrating the working and structure of Berthon's hydrostatic log.
Subject: Engineering / Hydrostatics |
| Extent | 2p |
| Format | Diagram |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |