Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/191

Rh hour, and are heated by steam or gas. The inking apparatus is placed at the back of the press, so that while the workman is placing another cover, the ink roller, by automatic action, inks the block ready for the next impression. The inking or printing of the covers is done without heat, so, to avoid loss of time, an arrangement is made that the heating box can be cooled immediately by a stream of water passed through it.

Messrs. Kampe and Co. have just brought out a blocking machine, which they claim to be superior to any in the trade. It will block at the rate of 700 to 800 covers per hour. The pressure is obtained by one of the most powerful of mechanical appliances, and it can be adjusted to block either paper or leather. The tools required for blocking are called blocks or stamps. These may be composed of very small pieces, or may be of one block cut to the size of the book. In any case, the block has to be fastened to the moveable plate at the bottom of the heating box. To block the sides of a book, take a stout piece of paper and glue it upon a moveable plate. Then take the book, and having set the blocks upon the side in exact position, place the side or board upon which are placed the blocks upon the bed of the blocking press, leaving the volume hanging down in front of the press. The bed is now to be fixed, so that the centre of the board is exactly under and in the centre of the heating box. When quite true, the sides and back gauges are fixed by screws. Pull the lever so that a slight pressure upon the plate be given: release