The room of the stereotypers is off by itself. There is a furnace in it, and a great caldron of melted type metal. They take the page of the paper which has just been made up; put it on a hot steam chest; spat down upon the type some thick pulpy paper soaked so as to make it fit around the type; spread plaster of Paris on the back, so as to keep the pulpy paper in shape; and put the whole under the press which more perfectly squeezes the pulpy paper down upon the type, and causes it to take a more perfect impression of the type. The heat of the steam chest warms the type, and quickly dries the pulpy paper and the plaster of Paris. Then the pulpy paper is taken off, and curved with just such a curve as the cylinders of the printing-press have, and melted type metal is poured over it, which cools in a moment; when, lo, there is a curving plate of type-metal just like the type! The whole process of making this plate takes only a few minutes. They use such plates as these, rather than type, in printing the great papers chiefly for reasons like these: 1. Because plates save the wear of type; 2. Because they are easier handled; 3. Because they can be made curving, to fit the cylinders of the printing presses as it would be difficult to arrange the type; 4. Because several plates can be made from the same type, and hence several presses can be put at work at the same time printing the same paper; 5. Because, if anything needs to be added to the paper, after the presses have begun running, the type being left up-stairs can be changed and new plates made, so that the presses need stop only a minute for the new plates to be put in--which is a great saving of time.