Mirror galvanometer
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A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. I
Thomson mirror galvanometer of tripod type, from around 1900
Galvanometer by H.W. Sullivan, London. Late 19th or early 20th century. This galvanometer was used at the transatlantic cable station, Halifax, NS, Canada
Modern mirror galvanometer from Scanlab
A moving coil galvanometer with its glass cover separated and mirror absent
Lord Kelvin
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William Thomson, 1st Baron Kelvin was a Scottish mathematician, mathematical physicist and engineer.
Mirror galvanometer
…galvanometer set-up, often with a servo-like control loop. The name is often abbreviated as galvo. The mirror galvanometer was improved significantly by William Thomson, later to become Lord Kelvin. He coined the term mirror galvanometer and patented the device in 1858. Thomson intended the instrument to read weak…
Kelvin, c. 1900, by T. & R. Annan & Sons
The meander of the River Kelvin containing the Neo-Gothic Gilmorehill campus of the University of Glasgow designed by George Gilbert Scott, to which the university moved in the 1870s (photograph 1890s)
William Thomson's telegraphic syphon recorder, on display at Porthcurno Telegraph Museum, in January 2019
Lord Kelvin's sailing yacht Lalla Rookh