PerspectiveGeophysics

Ships' Logs and Archeomagnetism

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Science  12 May 2006:
Vol. 312, Issue 5775, pp. 865-866
DOI: 10.1126/science.1126665

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Summary

Ships' logs help show that the strength of Earth's magnetic field was stable until the mid- 1800s. Since then, flux changes may have caused a steady decline in strength.