A 2¼ square film negative. The Type 12 frigate Yarmouth (1959) in No. 2 dry dock in Rosyth Dockyard. A close view of the canoe (lower section) of the dome of Hull Outfit 20 Type 174 sonar on the floor of the dock after removal from its position between 15 and 19 stations. The upper section of the dome is not in the picture. The photographer is on the floor of the dock looking down into the dome from the starboard quarter.