turn over the book, with the backing board, holding the board to the book by the thumb, so that it does not shift, and lay the other board at exactly the same distance on the other side. The whole is now to be held tightly by the left hand and lowered into the press. The boards may 
Backing Hammer. possibly have shifted a little during the process, and any correction may now be made whilst the press holds the book before screwing up tight, such as a slight tap with the hammer to one end of a board that may not be quite straight. Should the boards however be not quite true, it will be better to take the whole out and readjust them, rather than lose time in trying to rectify the irregularity by any other method. If the rounding is not quite true it will be seen at once, and the learner must not be disheartened if he has to take his book out of the press two or three times to correct any slight imperfection.
Before Backing.
After Backing.
The book and boards having been lowered flush with the cheeks of the press, screw it up as tightly as possible with the iron hand-pin. The back of the book must now be gently struck with the back of the hammer, holding it slanting and beating the sheets well over towards the backing boards. Commence from the centre of the back and do
