A roll film negative. On board the Tribal class type 81 frigate Mohawk (1962) in Portsmouth Dockyard. She was in a dry dock from 21 March to 11 April 1972 when she moved to the South Railway Jetty. In the sonar instrument compartment between 16 and 27½ stations on 3 deck. The photographer is looking to port and slightly aft from the starboard side showing a table top in the left foreground and eight racks of electronic equipment labelled B, C, D, E, F, G, K and L. They are shown to be 5000, 750 and 500 volts units.