| RefNo | AP/39/20/4 |
| Level | Item |
| Title | Unpublished diagrams, circuit of train signalling system by Charles Walker |
| Date | 9 March 1857 |
| Description | Two circuit diagrams, labelled figures 4-5, showing a schemantic of the train signalling system described by Walker.
Subject: Engineering / Electricity |
| Extent | 1p |
| Format | Diagram |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA3784 | Walker; Charles Vincent (1812 - 1882); technical editor and electrical engineer | 1812 - 1882 |