Marjorie, a Thames Barge
The story of the Thames Barge is a moral for today. This boat evolved slowly, over a thousand years, as a load carrier but paradoxically it was the coming of the age of steam that led to its greatest success. It could carry huge loads, it could be sailed with only three crew and it needed no fuel! This is a more general view.
The photo was taken as the Marjorie set sail from St Katherine's Dock, by Tower Bridge.