If it is intended to shape the edges of the board on the book, it must be cut about 1 cm. larger each way so as to allow for further trimming.
Fastening the boards to the book is called "boarding." This can generally be done as well with paste as with glue; the former is preferable but necessitates longer pressing and drying. Glueing is quicker, but the bands cannot then be pressed so evenly into the boards.
For ordinary fixing on the bands, the insides of the boards are pasted to about 3 cm. in width, the bands also pasted, and the board laid on, bringing it well up to the groove. If it is intended to glue up, the bands are also glued, provided they have not already been glued on--a method preferred by many experienced hands. The bands must be pasted so that they radiate from the back without any tangle; a morsel of paste the size of a pea is laid on the band from underneath with the folder or point of a knife, the band smoothed down, and the thing is done. After glueing-up, the book is pressed between boards. If zinc plates are placed under the boards whilst pressing, the pasted parts will be pressed quite smooth and shiny.
For cloth or half-cloth binding a hollow back is frequently glued on. To make the covering material of the back more lasting, a back is made up of strong wrappers or some other tough material, which extends over the back underneath the cover. This backing material must be cut 4 to 5 cm. wider than the width of the back and about 1 cm. longer each way than the book. This strip is pared very narrowly along both sides with a sharp knife on the so-called paring stone. A second strip--the backing--of the same material is cut the same length but exactly the width of the back of the book and is glued on to the middle of the wider strip. The overlapping parts at the sides are broken in towards the middle, close by the inner packing, and the crease well pressed down with the folder. These overlapping edges are then turned back again and a rule is laid on the packing parallel with the edge but drawn back to the middle about 2 to 3 mm. according to the thickness of the cover. If the moveable flaps are now again laid over towards the centre and narrowly creased near the first fold over the rule, a second parallel fold is obtained which allows the book to open much better. The back in section appears as illustrated in Fig. 55 after the middle part of the packing has undergone the necessary rounding.