Diagram of Faraday's iron ring apparatus — The changing magnetic flux of the left coil induces a current in the right coil Photo Credit: By Eviatar Bach - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=16608674
Old University Library (Erlangen) — Photo Credit: By Akriesch 20:42, 28 June 2006 (UTC) (auch de:Benutzer:Akriesch) - Own work, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=903663