How Glass Looking-glasses are made,

I have seen it. They take the melted Glass out with an Iron; with their blast they frame an empty Pillar; they open it on one side with their tongs, and whilst it is red hot they lay it upon a plain plate of Iron, that is equally made; and they put it into the furnace again, to make it softer; and that it may get the perfect plainness of the iron plate, they leave it over the furnace to cool by degrees: When it is cool, they do thus