Plate, figures 48-52 and 55 showing a square of thin sheet iron and electrodes attached to a series of iron squares by [William Thomson] Figures 48-52 and 55 showing the shape of a bent square of thin sheet iron and electrodes attached to a series of iron squares. For an early draft of figure 55 see PT/55/1/26. 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]