Plate, draft of figure 43 showing square of iron, copper wire, and electrodes by [William Thomson] Early draft of figure 43, incorporated within text, showing a square of iron connected to copper wire and electrodes. For later draft see PT/55/1/5. 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]