This image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicensePortable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Portable twin needle telegraph terminal. General three quarter view. Grey background
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Portable twin needle telegraph terminal. Detail view of face.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Portable twin needle telegraph terminal. Detail view of terminals on back of unit.
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Portable double-needle telegraph and test set, with removable wooden cover, unknown maker, possibly British, 1850.
This small instrument is both a telegraph instrument and a test set. It was compact enough to be carried by the telegraph lineman when inspecting and repairing telegraph wires. It worked using two pairs of press-buttons at the back of the case. When the instrument was required to work as a galvanometer (an instrument for detecting electric currents), a lever inside the case withdraws the needle stops, allowing the needles to swing fully across the dials. With the ivory stops in position the needles were used to send and receive messages using the standard double-needle code.
Details
- Category:
- Telecommunications
- Object Number:
- 2004-123
- Materials:
- glass, metal (unknown) and wood (unidentified)
- taxonomy:
-
- component - object
- credit:
- Donated by BT Heritage and Archives
