Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/192

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152
BOOKBINDING.

the press, and take out the book and examine if all be correct. Some of the blocks may require a small piece of paper as a pad, so as to increase the pressure, others to be shifted a little. Now glue the back of the stamps and replace them in their respective places. Place the whole under the top plate in the press, heat the box, and pull the lever over; and let the book remain for some little time to set the glue. Take out the book, examine if perfectly square and correct, but replace it with a soft mill-board under the stamps, and pull down the press. The lever must remain over, and the blocks be under pressure until the glue is hardened.

Another method is to glue upon the plate a piece of thick paper and mark upon it the exact size of the book to be blocked. Strike upon the plate from the size the centre, and from that any other lines that may assist in placing the blocks. Arrange the blocks upon the plate so as to form the design; when correct, paste the blocks on their backs and replace them on the plate. When the paste adheres a little, turn the plate over and put it into the press. Apply heat to the box; pull the lever over, and when the paste is set, regulate the bed and gauges.

When the press is properly heated, throw back the lever; take out the mill-board from under the stamp, and regulate the degree of pressure required by the side-screw under or over the bed. Place upon the bed the side to be stamped, hold it firmly against the guides with the left hand, and with the right draw the lever quickly to the front. This straightens the toggels and forces down the heating box, causing a sharp impression of the stamp upon the leather or other material. Throw or let the lever go back sharply, and take out the book. If the block be of such a design that it must not be inverted, the whole of the covers must be blocked on one side first, and the block turned round for the other side, or the design will be upside down.