Plate, figures 31-33 and 36 showing sheet iron and an apparatus for testing the direction of electric current by [William Thomson] Figures 31-33 and 36 showing an L-shaped piece of sheet iron, an apparatus for testing the direction of the effect of thermoelectric qualities, a magnetised conductor, and a diagram of the direction of electric current through the sheet iron. An earlier draft of figure 33 is found at PT/55/1/22. 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]