Abstract
Everyone likes to play with toys and entertain themselves with devices built to amuse or mystify. The authors became intrigued with tabletop devices originally designed to demonstrate magnetic “levitation.” Toys of this type can be purchased commercially1 or assembled from a kit.2 We found that such an inexpensive device could be used to monitor the daily variations in the Earth's local magnetic field. A comparison of our daily observations with those of international geomagnetic observatories shows remarkably similar patterns of magnetic variation.
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