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The Laxey Wheel (also known as Lady Isabella) is built into the hillside above the village of Laxey in the Isle of Man. It is the largest surviving original working waterwheel in the world. The Great Laxey Wheel at Manx National Heritage. Retrieved 26 October 2022 Designed by Robert Casement, the wheel has a diameter, is wide and revolves approximately three times per minute.
The wheel is currently maintained by Manx National Heritage as part of the Great Laxey Wheel & Mines Trail.
The wheel features today on the reverse of the £20 notes issued by the Isle of Man Government.
Water from the surrounding area – including a number of local springs and streams – is collected in a cistern, which is above the level of the top of the wheel. A closed pipe connects the cistern to the top of the wheel; thus the water flows up the tower as an inverted syphon. The water falls from the pipe into the buckets (formed from wooden slats on the circumference) and makes the wheel rotate in what is described as the 'reverse' direction: it is a backshot wheel. The crank has a throw of and connects to a counterweight and to a very long rod. This rod runs along the rod viaduct to the pumping shaft 200m away, where the stroke is converted by a T-rocker into a pumping action.
Most of the wheel and rod is made of wood; while key mechanical parts are metal to provide tension and bearing surfaces. The rod has wheels attached at intervals to permit the stroke's motion with minimal friction.
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