The Laxey Wheel or Lady Isabella measures 22 metres in diameter and is 1.8 metres wide. It was built in 1854 and is a pitch back-shot wheel powered by water supplied from a cistern on the hillside. 


The viaduct carrying the pump-rods is shown at SC 432853 on the 1957 1:10560 scale Ordnance Survey map. The viaduct leads from the wheel and up the valley to the pump head and engine shaft. The wheel was built to work the pumps in the Engine Shaft some 410 metres away. Its power was transmitted by a sectional timber beam running on miniature, railway-type , bogies on tracks carried on an arched stone viaduct. An extensive system of lades brought water to drive the wheel itself and numerous other pieces of water-powered equipment.