Javascript must be enabled to view this site.

Read our system requirements.

Lord Kelvin's mirror galvanometer with lamp and stand, 1858.
1 of 1

Lord Kelvin's mirror galvanometer with lamp and stand, 1858., result 1 of 1

Item Details
Open Artstor
Available to everyone
Title
Lord Kelvin's mirror galvanometer with lamp and stand, 1858.
Thomson mirror speaking galvanometer, made by Elliott Brothers
Work Type
Telecommunications
Date
1858
Location
Strand
Material
brass (copper, zinc alloy); cardboard; glass; iron; lead (metal); metal (unknown); wood (unidentified)
Measurements
overall: 275 mm 223 mm, 2.2 kg
Description
Thomson mirror speaking galvanometer with lamp and stand, made by Elliott Brothers, Strand, London, 1858; Thomson mirror speaking galvanometer with lamp and stand, 1858; Thomson mirror speaking galvanometer with lamp and stand, Elliott Brothers, Strand, London, 1858; Thomson mirror speaking galvanometer with lamp and stand, made by Elliott Brothers, Strand, London, 1858.; A mirror galvanometer is a particularly sensitive electrical indicating instrument and was used to detect the extremely weak currents received through long submarine cables. Instead of a needle indicator, a mirror with a bar magnet cemented on the back is suspended on silk threads within the coil. A beam of light shone on the mirror is reflected on to a scale card some distance away, thus magnifying any movement of the mirror. Instruments of this type were used on the Atlantic cable expedition of 1858. The mirror galvanometer became the standard instrument for receiving telegraph messages, but it did have a disadvantage in that it needed two operators - one to read and call the signal, and another to write the message down. This problem was solved by Thomson when he invented the siphon recorder, which used a glass tube dipped ink to record to movements of the cable on a moving tape, to then be read and decoded.
Repository
Science Museum, Information Age Gallery: Cable
Donated by the Eastern Telegraph Company
ID Number
co33167
Source
Image and original data from Science Museum Group - https://collection.sciencemuseum.org.uk
Rights
The source metadata displayed in the Description field is released under a Creative Commons Attribution 4.0 license - https://creativecommons.org/licenses/by/4.0/. All other source metadata is released under Creative Commons Zero - https://creativecommons.org/publicdomain/zero/1.0/. The image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License - https://creativecommons.org/licenses/by-nc-sa/4.0/.
File Properties
File Name
large_1925_0179_0001__0001_.jpg
SSID
26241525

Now viewing Lord Kelvin's mirror galvanometer with lamp and stand, 1858.