Essays concerning iron and steel [electronic resource] : the first, containing observations on American sand-iron: the second, observations, founded on experiments, on common iron-ore, with the Method of reducing it first into Pig or Sow-Metal, and then into Bar-Iron; on the Sort of Iron proper to be converted into good Steel, and the Method of refining that Bar-Steel by Fusion, so as to render it fit for the more curious Purposes: With an Account of Mr. Reaumur's Method of softening Cast-Iron; and an Appendix, Discovering a more perfect Method of Charring Pit-Coal, so as to render it a proper Succedaneum for charred Wood-Coal. By Henry Horne.