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    Magnetograms are used to record variations in the Earth's magnetic field. Original paper magnetograms were recorded using photographic technqiues at Kew, Greenwich, Abinger, Hartland, Eskdalemuir and Lerwick Observatories. These magnetograms start in the 1840s and end in 1986 at which time digital recording of the magnetic field took over and magnetograms can be produced by computer graphic. The plots show variation in the Earth's magnetic field, typically over a 24-hour period.