Faraday's 1845 magneto-optical electromagnet and sectored disc
1845
The surviving electromagnet Faraday used in 1845, photographed with one of his sectored discs. This is the actual instrument at the heart of both the Faraday effect and the diamagnetism discovery: the bismuth bar was hung between these poles. A modern photograph of a genuine 1845 object, so it is object-period-correct even though the exposure is recent.
Source: Wikimedia Commons
Part of Diamagnetism · Watch in the documentary
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