| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| Foucault pendulum |
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| NOUN: | A simple pendulum suspended from a long wire and set into motion along a meridian. The plane of motion appears to turn clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere, demonstrating the axial rotation of the earth. | | ETYMOLOGY: | After Jean Bernard Léon Foucault.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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