Mould Stone at Deep Swincombe Blowing House
This photograph shows evidence of the tin mining industry which operated on Dartmoor until around 1939. Blowing houses (sometimes called blowing mills) contained small blast furnaces into which a forced draught of air was blown using waterwheel-powered bellows. Cassiterite (tin oxide) ore was smelted in the blast furnace and cast into ingots using a mould stone. Burnard comments on the photograph that 'this is probably one of the most ancient moulds' that he had seen on Dartmoor.