History of anthracite coal mining in Pennsylvania History of anthracite coal mining in Pennsylvania There are two types of coal found in Pennsylvania: anthracite (the “hard coal” found in Northeastern Pennsylvania below the Allegheny Ridge southwest to Harrisburg; also called “stone coal”, “rock coal” in the 1800s) and bituminous (“soft coal”, found west of the Allegheny Front escarpment). Anthracite coal is a natural mineral with a high carbon and energy content that gives off light and heat (produced energy) when burned, making it useful as a fuel. It was possibly first used in Pennsylvania as a fuel in 1769, but its real history begins with a documented
A-class destroyer (1913) tons and had a length of around . All were powered by triple expansion steam engines and had coal-fired water-tube boilers (although initially, some had "locomotive type" fire-tube boilers in lieu). Armament was generally one QF 12 pounder on a bandstand on the forecastle, up to five QF 6 pounder and 2 single tubes for torpedoes. The "Daring" and "Havock"-class ships initially had a third tube in the bow, fixed to fire straight ahead, but this was found to weigh down the bows and it was possible for the ship to run over its own torpedo when moving at high