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.
Email Address: Jonesboro, the county seat for Clayton County, incorporated as a town December 13, 1859. Residents originally called the city Leaksville. When the railroad passed through the area, however, residents renamed the city to honor Captain Samuel G. Jones, one of the line's surveyors.