A blast furnace is a special type of furnace. They are used to make iron from ore. Blast furnaces are very large. They can be up to 60 metres (200 ft) tall and 15 metres (49 ft) in diameter.
Jonesborough, Tennessee. Jonesborough (historically also Jonesboro) is a town in, and the county seat of, Washington County, Tennessee, in the southeastern United States. The population was 5,975 at the 2010 census. It is Tennessee's oldest town.
Seat Information. The Nov. 30, 1858 act creating Clayton County designated Jonesboro as county seat.The community was settled in the early 1820s in what was then Fayette County. In 1823, local leaders named the town Leaksville in recognition of Garlington Leak, a respected member of their community.