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To Clean Steel and Iron

Make 1 ounce soft soap and 2 ounces emery into a ounces black oxide of manganese; expose the paste; rub it on the article with wash-leather whole 1½ hours to a high heat, and run into and it will have a brilliant polish . Kerosene moulds. oil will also clean steel. 3278. Το Blue Steel. The mode employed in blueing steel is merely to subject it to heat. The dark blue is produced at a temperature of 600°, the full blue at 500°, and the blue at 550°. The steel must be finely polish- Steel The addition of a small quan- ed on its surface, and then exposed to a unitity of carbon greatly increases the hard- form degree of heat. Accordingly, there are ness and tenacity of iron, and converts it into three ways of coloring: first, by a flame proand tenacity of iron, and converts it into three ways of coloring: first, by a flame prosteel. The amount of carbon to be added, ducing no soot, as spirit of wine; secondly, should be just that which will produce the by a hot plate of iron; and thirdly, by wood maximum of hardness and toughness, without ashes . As a very regular degree of heat is rendering it brittle; ordinary steel contains necessary, wood ashes for fine work bear the about 1 per cent. of carbon; hard steel 1.6 to 1.7 per cent. The percentage of carbon in English steel is estimated by Berthier to be 1.87. It melts at about 2500° Fahr.