Plate, figure 41 showing arrangement for experiment to test longitudinal conductivity of magnetised iron wire by [William Thomson] Drawing of an arrangement of instruments for testing longitudinal conductivity of a longitudinally magnetised iron wire. Includes a Daniell's cell, a galvanometer, silk-covered copper wire, brass tubing, and iron wire. Includes numerous graphite annotations. Subject: Physics Published in Philosophical Transactions as 'The Bakerian lecture.-On the electro-dynamic qualities of metals'. Received and read by the Royal Society on 29 February 1856. [1856]