Ro′ta-ry Pud′dler.
(Metallurgy.) An apparatus in which iron is puddled by rotary mechanism instead of by hand labor. The idea is believed to have occurred to Henry Cort, but the first practical attempt to execute it appears to have been made by Yates and Tooth, who constructed a furnace having a rotating trough, with fixed rabbles through which a current of water was conducted to prevent them from melting, which, however, it did not effect. The Bromhall puddler was arranged with four rabbles, which were caused to assume different angles, as they were drawn over the bed of the furnace. Subsequently, Mr. Menelaus, manager of the Dowlais Works, contrived a cylindrical rotary furnace, in which the puddling was effected by the rotation of the furnace alone. This was not successful in practice, owing to the great expansion and contraction and the rapid destruction of the lining. About 1867, Mr. Danks of Cincinnati developed the first practical rotary puddling-furnace. This has since been greatly improved, and has been, to some extent, introduced into Great Britain and the Continent of Europe. See puddling-furnace.