Three telegraphic signalling block instruments
Three telegraphic signalling block instruments, double- and two single-needle versions, patents of G.K.Winter and J.Craik, 1880 and 1885, cases removed to show mechanism.
Details
- Category:
- Signalling & Telecommunications
- Object Number:
- 1909-8
- type:
- telegraph instrument
- credit:
- Imperial Institute of the United Kingdom of the Colonies & India