Plate, figures 43 and 47 showing a square of iron, copper wire, and electrodes and a diagram of equipotential shift by [William Thomson] Figures 43 and 47 showing a square of iron connected to copper wire and electrodes and a diagram illustrating the shift of the equipotential line in the iron square caused by magnetisation. For earlier draft of figure 43 see PT/55/1/23. An earlier draft of figure 47 is found at PT/55/1/24. 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]