The windmill was a Medieval European innovation and both wind and water mills were not just used for grinding flour but also fuilling cloth, making leather and driving bellows and trip-hammers.

FORBES: What Are Examples of Things in the "Common Knowledge" about History That Historians Almost Universally Consider Incorrect?

As part of the day some of the country's top blacksmiths will be producing test pieces for judging and will also be demonstrating the foundry's unique water-powered trip hammers.

BBC: Devon - Get fired up at foundry day