A 2¾ x 2¼ film negative. On board the Type 12 frigate Yarmouth (1959) alongside the South-West Wall in Portsmouth Dockyard. Inside the Guided Weapons Systems power room on the starboard side of 1 deck between 47½ and 52 stations. The photographer is looking aft and slightly to port. Three stacks of electrical units are on the right and a Westinghouse rectifier unit is on the left. Spare batteries are on the deck under the rectifier unit.