CAST-IRON. - When the parts of machinery that are made in cast-iron are polished they are treated as described in this catalogue under the general article on Machinery made of iron and steel.

The Front of Stoves, and similar bright works in cast iron, are first ground on large grindstones, and then buffed on large revolving buffs upon which a coating of emery has been fixed by glue. They are sometimes finished by a hand rubber used as a spokeshave having a piece of leather supplied with fine emery and oil, but the rubbers suspended from the ceiling at the end of a powerful spring, are also very judiciously employed in these large works. See the end of the article Burnisher.

Fire Irons are often cast in iron that is afterwards rendered malleable; which is a rapid way of producing beautiful form, combined with strength and a certain measure of flexibility, see vol. 1, page 259, the works are afterwards case-hardened, that they may admit of a better lustre, and which is generally given by grindstones, glazers, buffs and brushwheels, much the same as in cutlery but on a larger scale.