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.
Tennessee Counties and County Seats: Anderson County - Clinton Bedford County - Shelbyville Benton County - Camden Bledsoe County - Pikeville Blount County - Maryville Bradley County - Cleveland Campbell County - Jacksboro Cannon County - Woodbury Carroll County - Huntingdon Carter County - Elizabethton Cheatham County - Ashland City Chester County - Henderson