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Science 12 May 2006:
Vol. 312. no. 5775, pp. 865 - 866
DOI: 10.1126/science.1126665
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Perspectives

GEOPHYSICS:
Ships' Logs and Archeomagnetism

Masaru Kono

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.

The author is professor emeritus at the Tokyo Institute of Technology, Tokyo, 152-8551, and Okayama University, Okayama 700-8530, Japan. E-mail: masarukono{at}nifty.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)