Magnetograph

n. device used to measure magnetic fields

A magnetograph is one of two types of scientific instrument: A special type of magnetometer that records a time plot of the local magnetic field near the instrument; orA telescope capable of producing magnetograms: maps of the magnetic field strength and/or direction on a distant object such as the Sun, using the Zeeman splitting or other spectral signatures of magnetization. (see vector magnetograph)
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(n.)
An automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements.
  

magnetograph
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