Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/85

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55
MILL-BOARDS.

These are simply to save the press from being cut; and a piece of old mill-board is generally placed on the cut-against, so that the plough knife does not cut or use up the cut-against too quickly. The boards are now, if for whole-binding, to be lined on both sides with paper; if for half-binding only on one side. The reason for lining them is to make the boards curve inwards towards the book. The various pastings would cause the board to curve the contrary way if it were not lined. If the boards are to be lined both sides, paper should be cut double the size of the boards; if only one side, the paper cut a little wider than the boards, so that a portion of the paper may be turned over on to the other side about a quarter of an inch. The paper is now pasted with not too thick paste, and the board laid on the paper with the cut edge towards the portion to be turned over. It is now taken up with the paper adhering, and laid down on the press with the paper side upwards, and rubbed well down; it is then again turned over and the paper drawn over the other side. It is advisable to press the boards to make more certain of the paper adhering, remembering always that the paper must be pasted all over very evenly, for it cannot be expected to adhere if it is not pasted properly.

When the books are very thick, two boards must be pasted together, not only to get the proper thickness, but for strength, for a made board is always stronger than a single one. If a board has to be made, a thick and a somewhat thinner board should be fastened together with paste. Paste both boards and put them in the standing press for the night. Great pressure should not be put on at first, but after allowing them to set for a few minutes, pull down the press as tight as possible. When placing made boards to the book, the thinner one should always be next the book. It may be taken as a general rule that a thinner board when pasted will always draw a thicker one.