The dots are bistable — staying put when power is removed. This is achieved with a U-shaped electromagnet. The polarity of a driving pulse applied to the coil determines which way to flip the ...
Horseshoe-shaped electromagnet used by James Joule, c.1840. This electromagnet was used by the scientist James Joule for experiments about energy. Joule was a Salford resident and the son of a brewer.
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