A half plate sheet film negative. On board the Type 12 frigate Yarmouth (1959) alongside the south-east corner of the fitting out basin in John Brown & Co Ltd's shipyard at Clydebank. In the electronic maintenance room on 1 deck between 39 and 41½ stations looking aft and to starboard from the doorway. On the left is a T.I.U. Mk 5 maintenance assembly console made by Elliott Brothers (London) Ltd, with a test bench next to it. Underneath the test bench are Mk 22P, Mk 19, Mk 21 and Mk 3MA test units, above it are two amplifier test panels and on the bulkhead to the right are control boxes for an asdic type 177 test panel. An empty key cabinet is next to a test and repair bench.