Nov 4, 2014
This image shows Faraday’s original diamagnetic apparatus, which is still in place in the laboratory space within the Faraday Museum at the Ri.
The electro-magnet below the desk was made from a half a link of an anchor chain (which Faraday obtained from the whalers 'Enderby' operating out of Greenwich) wound with insulated wire.
On 4 November 1845, Faraday discovered that a piece of heavy glass when hung between the poles of an electro-magnet aligned itself equatorially between the poles when the current was on. This he noted would probably allow him to extend dimagnetic properties into opaque bodies.
This is his discovery of the diamagnetic condition in a transparent ponderable body.