Editing Mirror galvanometer (section)

== Moving coil galvanometer ==
[[File:Galvanometro a bobina mobile di Deprez D'Arsonval - Museo scienza tecnologia Milano 10979 01.jpg|thumb|left|A moving coil galvanometer with its glass cover separated and mirror absent]]
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Moving coil galvanometer was developed independently by [[Marcel Deprez]] and  [[Jacques-Arsène d'Arsonval]] about 1880. Deprez's galvanometer was developed for high currents, while D'Arsonval designed his to measure weak currents. Unlike in the Kelvin's galvanometer, in this type of galvanometer the magnet is stationary and the coil is suspended in the magnet gap. The mirror attached to the coil frame rotates together with it. This form of instrument can be more sensitive and accurate and it replaced the Kelvin's galvanometer in most applications. The moving coil galvanometer is practically immune to ambient magnetic fields. Another important feature is self-damping generated by the electro-magnetic forces due to the currents induced in the coil by its movements the magnetic field. These are proportional to the angular velocity of the coil.