Falkirk Wheel
The Falkirk Wheel is one of the most remarkable pieces of engineering in Britain, a unique rotating boat lift connecting the Forth and Clyde Canal with the Union Canal at Falkirk in central Scotland that replaced a series of eleven derelict locks with a single structure of extraordinary ingenuity. Built as part of the Millennium Link project to restore Scotland's central belt canal network, the wheel opened in 2002 and has become both a working piece of transport infrastructure and a major visitor attraction in its own right, drawing visitors from across Britain and beyond.
The wheel lifts boats twenty-four metres between the two canals in gondolas balanced by the principle of Archimedes: since a floating boat always displaces exactly its own weight of water, the two gondolas in which boats travel are perpetually in counterbalance regardless of the weight of vessels they contain. The energy required to rotate the entire structure is therefore only that needed to overcome friction, making the wheel one of the most energy-efficient boat lifts in the world and a practical demonstration of the elegance available when engineering works with rather than against physical principles.
The visual form of the wheel, designed by the engineering company Arup with architects RMJM, gives physical expression to the engineering principle. The great curving arms sweeping upward from the lower canal basin to the aqueduct of the upper canal suggest simultaneously a Celtic double-headed axe, a set of propeller blades and a turning wheel, and the structure's appearance changes dramatically as it rotates through its cycle. Boat trips through the wheel, lifting passengers from the lower canal basin to the upper level and back, allow visitors to experience the rotation from inside the gondola.
The canal towpaths at both levels of the wheel provide excellent walking and cycling, and the restored canal network extends the experience through the Central Belt.