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Telegraphy, Equipment KelvinÕs mirror galvanometer with lamp and stand, 1858

IMAGE number
UIS5065146
Image title
Telegraphy, Equipment KelvinÕs mirror galvanometer with lamp and stand, 1858
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Location
Science Museum, London, UK
Medium
object
Image description

Telegraphy, Equipment KelvinÕs mirror galvanometer with lamp and stand, 1858. The Scottish physicist Sir William Thomson, later Lord Kelvin (1824-1907), invented the mirror galvanometer in 1858. This instrument consists of a mirror attached to a small steel magnet. The mirror is suspended by a thread between two copper coils. When an electric current passes through the coils, the magnet moves according to the magnetic field created. Light passing from a lamp through a slat in a screen is reflected by the mirror onto a graduated scale. Changes in the electro-magnetic charge would produce movements on the screen. The mirror galvanometer was used in the first Atlantic telegraph transmissions in 1858, and Thomson amassed a large personal fortune from cable patents and consultancy fees. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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