Strutt's North Mill

Strutt’s North Mill stands beside the River Derwent in Belper, Derbyshire. It is one of the Derwent Valley Mills, a group recognised by UNESCO in 2001. The town lies between Derby and Matlock, making the mill easy to reach. The original mill opened in 1786 but burned down in 1803. William Strutt rebuilt it in 1804 on the same stone foundations. This new building became one of the first iron-framed structures in the world. The mill shows how early engineers tried to stop fires in cotton mills. William Strutt used cast-iron beams shaped like turtle backs to support brick arches. These arches carried the weight while keeping floors level. Wrought-iron ties hidden above the arches stopped the brickwork from spreading. The roof was slate with internal gutters to carry away rain. A large breast-shot waterwheel by Thomas Hewes powered the whole building. Inside, visitors find five floors arranged for cotton spinning. Raw bales arrived at ground level and were cleaned and carded on the upper floors. Over 130 carding engines disentangled fibres into slivers. Drawing frames straightened the slivers before spinning machines turned them into thread. Thirty-four Arkwright water frames spun 4,236 threads at once. The top floor held reeling and doubling frames ready for dyeing elsewhere.