| Today we remember Peter Barlow (1776-1862) for his mathematical
tables, the Barlow Lens, and Barlow's Wheel (1822). Electric current passes
through the wheel from the axle to a mercury contact on the rim. The interaction
of the current with the magnetic field of a U-magnet laid flat on the baseplate
causes the wheel to rotate. Note that the presence of serrations on the
wheel is unnecessary.
Other examples can be found with the Daniel Davis apparatus.
REFERENCE: Thomas B. Greenslade, Jr., "Barlow's Wheel", Rittenhouse, 1, 26-28 (1986)
Colby College -- magnet missing Smithsonian Institution -- magnet missing
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