John Dunlop, son of James Dunlop who founded Bellefonte, put Bell Font Forge into blast in 1797 and soon began construction of Logan Furnace a few miles further downstream. A major figure in early ironmaking, Dunlop also was involved in the building of Harmony Forge at what would become the Milesburg Iron works and Washington Forge now Clinton County. When Dunlop was killed in a mining accident in 1814, his estate was purchased by Bond, Jacob, George, Reuben, and Samuel Valentine, and William A. Thomas, all from Chester County, who operated all of the Dunlop furnaces and forges as Valentine and Thomas Ironworks. The Logan Furnace Mansion is located on Route 144 and a few other remains of the iron plantation still exist on the west side of Logan Branch.
