Lime-kiln
An oven or a pit, built of brick, with an interior lining of fire-brick. Intermittent kilns are such as have the fuel on the bottom and the stone above it, making it necessary to withdraw every charge. Running kilns are usually in the form of an inverted cone, and are charged with alternate layers of fuel and stone, so that the lime is withdrawn at the bottom as it is burned, fresh fuel and stone being constantly served at the top. The process of burning expels the water and carbonic-acid gas from the stone, which falls to pieces on exposure to the air after removal from the kiln, and crumbles into a white flaky powder which is called quicklime, or slaked lime, and is possessed of highly caustic properties. See LIMESTONE; LIME.