CHAPTER IX.

ROLLED OR PLATE GLASS.

Rolled plate glass--Furnaces--Raw materials--Process of ladling--The rolling table--Annealing--Cutting and sorting--Patterns on rolled plate--“Figured” rolled plate--Machine used for double-rolling--Polished plate--Raw materials--Casting from melting pots-- Special casting pots--The rolling table--Importance of flatness--Annealing kilns--Grinding and polishing processes--Machines used for grinding and polishing-- Method of holding the glass--Abrasives and polishing materials--Theory of the polishing process--Limiting sizes of polished plate--Homogeneity of polished plate-- Uses of plate glass--Bent polished plate--Mirrors-- Bevelling, process and machines--Wired plate glass, rolled and polished--Difficulties and limitations-- Advantages of wired glass _p._ 122