plate hat (plathat)

A hat made with an produced in the proce of refining pig-iron as preparatory to its being puddled in the reverberatory furnace, according to the method followed in Yorkshire for the production of a high cla of iron. Such plates are grooved on the bottom and have been cooled rapidly, so as to be easily broken in pieces. Also called line - metal, white metal, or simply metal. plate-mill (plat'mil), п. A mill for rolling metal plates. It usually has long rolls, nece itated by the width of the plates, and the rolls are made very heavy and strong in order to prevent springing and consequent greater thickne of the plates in the middle than at the sides.