Faraday to Gustav Heinrich Wiedemann   30 November 1860

30 Novr. 1860 London

My dear Sir

I think I wrote to you saying that I had sent your letter to Mr. Holmes that he might answer your enquiries. It was only yesterday that I had his reply in return. I hoped it might have been fuller but as it is I send it to you & perhaps it contains as much or even more than you desired[.]

Your results with an iron wire in the axis of a helix interest me much¹[.] You speak of a torsion action I suppose no action of the kind or indeed any action would occur if the axial wire were not magnetic or were diamagnetic. It has long been a question with me is there any mutual action or relation between two straight wires (copper) separate but at right angles to each other and carrying electric current and if there is what kind of relation is it[.]

Give my kindest thought to my dear friend M. Schoenbein[.]

Ever My dear M. Wiedemann | Yours Very Truly | M. Faraday

Address: Professor G. Wiedemann | &c &c &c | University | Basle | on the Rhine