Note 6 — SOME ACCOUNT OF FRANCIS'S LIFE-BOATS AND LIFE-CARS.

There are nine of these presses in the printing-rooms of Harper and Brothers, all constantly employed in smoothing sheets of paper after the printing. The sheets of paper to be pressed are placed between sheets of very smooth and thin, but hard pasteboard, until a pile is made several feet high, and containing sometimes two thousand sheets of paper, and then the hydraulic pressure is applied. These presses cost, each, from twelve to fifteen hundred dollars.