Two R. & H. Green & Silley Weir mechanical engineers at work in the engine room on board an unknown ship. They are inside the crankcase of a diesel motor. One is wearing a pair of oil-soaked plastic gloves and has a ring spanner on a nut at the end of a bearing marked A2. The other is holding a piece of polished wood. The location may be any of the docks in the Port of London or in Falmouth.