Laxey Wheel

Laxey and the surrounding hills have ores of lead, zinc, copper and traces of silver. These were mined in a small way from the 13th century but the process ramped up in the 19th, and deeper mines required incessant pumping to prevent flooding. By then steam power was replacing watermills on mainland Britain, but the Isle of Man lacked coal. This huge waterwheel (also known as "Lady Isabella") was built in 1854: at 72 ft 6 in (22.1 m) in diameter it's the world's largest still in use. Water from higher up the hill is siphoned to the top of the tower and falls onto the wheel buckets in a "backshot" design. It rotates 3 times a minute and the motion is conveyed by a 200-m rod to a rocker that drives the pumps. Visitors also explore an old mine adit.