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Old stone walls record the changing location of magnetic north

  • Written by John Delano, Distinguished Teaching Professor of Atmospheric and Environmental Sciences, University at Albany, State University of New York
Old stone walls record the changing location of magnetic northThe orientations of the stone walls that crisscross the Northeastern U.S. can tell a geomagnetic tale as well as a historical one.John Delano, CC BY-ND

When I was a kid living in southern New Hampshire, my family home was on the site of an abandoned farmstead consisting of massive stone foundations of quarried granite where dwellings once stood....

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