Tin Plate

—Thin sheets of soft iron or mild steel which have been coated with tin by dipping in a bath of melted tin which serves to protect the iron from rust and gives it a bright surface. After preliminary scaling, by dilute hydrochloric acid, heating, hammering and rolling, the plates are pickled, first in acidulated bran, then in a solution of sulphuric acid. This is followed by a clean water bath and scouring with sand and hemp. A number of plates, previously greased, are plunged for an hour or more in a bath of molten tin, whose surface is protected against oxidation by a thick layer of tallow. Upon removal, aftec draining in an iron rack, the sheets are placed in a second bath from which they are taken out singly, swept with a hemp brush, and dipped a third time to remove the brush marks. ext, they are dipped into melted tallow, and allowed to drain once more. Following this. the plates are dipped into a pot containing a little tin, which melts off the list or rim of tin along either end; the grease is removed by rubbing with dry bran; _the plates are finally sorted and boxed for worldwide consumption.;