Iron, Pig Crude iron as it comes from a blast furnace during the refining of iron ore. Use of a solder iron as the source of heat to solder. Ironwood Extremely hard, heavy wood taken from the Lyonothamnus Floribundus or Caprinus Caroliniana trees of southern California. Used more commonly in furniture than in building, due to its cost. Iron, Wrought Iron that has small amount of slag added to the hot iron at a temperature that will not fuse it to the iron, and distributed throughout.
Wrought iron is used primarily in fences, railings, screens and ornamental ironwork.
Irregular Brace Table Twelfth and sixteenth scales on a framing square, usable to calculate sides of right triangles with angles other than 45 degrees. Regular framing square brace tables can only calculate dimensions for right triangles with 45-degree angles. Irrevocable Something that cannot be taken, returned, or revoked. The zoning of a portion of land in a given area for different purposes than its surrounding functions. Also called spot zoning.