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.
QUICK LINKS. City History. The history of Jonesboro as a settlement goes back to the early days when settlers arrived in upper middle Georgia. Jonesboro was originally called Leaksville, and records show that as early as 1823, the State of Georgia granted a charter for the Leaksville Academy, in what was then Fayette County.