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To Convert Iron into Steel

preference. The work must be covered over with them, and carefully watched; when the color is sufficiently heightened, the work is with a very dilute muriatic acid. perfect. This color is occasionally taken off This is usually done by the process of cement- 3279. Το Blue Small Steel Articles. ation, producing what is termed blistered steel. At the bottom of a trough about 2 feet square and 14 feet long, usually formed of fire clay, is placed a layer, about 2 inches thick, of a cement composed of 10 parts charcoal and 1 part ashes and common salt; upon this is laid a tier of thin iron bars about + inch apart; between and over them, a layer Make a box of sheet iron, fill it with sand, and subject it to a great heat. The articles to be blued must be finished and well polished.

Immerse the articles in the sand, keeping watch of them until they are of the right color, when they should be taken out, and immersed in oil. of cement is spread, then a second row of bars, Cast-Steel and Iron. This method consists 3280. Το Make Edge-Tools from and so on, alternately, until the trough is in fixing a clean piece of wrought iron, brought nearly full; lastly a layer of cement covered to a welding heat, in the centre of a mould, with moist sand and a close cover of fire-tiles, and then pouring in melted steel, so as entirely so as to exclude the air. The trough is ex- to envelop the iron; and then forging the posed to the heat of a coal fire, until a full mass into the shape required.