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 and one is using a sledge hammer to hit a ring spanner to loosen a nut on a bearing. The other man has his foot on the ring spanner to keep it in place. The location may be any of the docks in the Port of London or in Falmouth.