Blowing Houses were part 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.
This the plan of the Lower Blowing House at Week Ford.
plan of house
Weekford blowing house
Image - Black and White Print