Grooves or channels used in a variety of locations on bindings to accommodate a number of different components. These include recesses cut across the spine of a bookblock to accommodate one of several structural processes. They may not all be of the same size or shape, and may be used for either sewn supported, sewn unsupported or adhesive structures, sometimes combining different functions within the same bookblock. Recesses could also be cut across the spines of bookblocks composed of single leaves to accommodate recessed supports in overcast groups of leaves and in oversewn bookblocks. V-shaped recesses were used in Byzantine bindings to allow the chainstitches formed by the unsupported sewing structures typical of such bindings to lie below the surface of the spine and so create the smooth spines which are another characteristic feature of these bindings. Recesses can also be found in wooden boards, to accommodate the thickness of clasp straps, metal chain shackles, pencils for early almanacs, etc.
Recesses cut or sawn across the spine of a bookblock either to accommodate recessed sewing supports or the chains of stitches of unsupported sewing structures.
Recesses created on the edges of a board to accommodate a fastening.
Recesses cut across the spine folds of a bookblock in order to allow adhesive to reach the centre fold of each gathering. This technique was used in both adhesive structures (with or without an adhesive support) or in sewn structures where adhesive recesses were sometimes used in addition to sewn stations to reinforce a weak structure. They will generally be found between the sewing stations.
Recesses created by a saw on the spine of the bookblock either to accomodate recessed sewing supports or as adhesive recesses to allow the adhesive on the spine to reach the inner bifolia of each gathering.
Recesses created with a knife on the spine of the bookblock either to accomodate the thread in unsupported sewing stations or to act as adhesive recesses to allow the adhesive on the spine to reach the inner bifolia of each gathering.
Recesses cut across the spine of a book with two angled knife-cut to remove a small v-shaped section of the spine folds.
Shallow recesses cut into the borders of the external surface of boards to accommodate the ends of clasp straps and into which they are usually secured by nails. They are usually square or rectangular in shape, and may either be of the same depth all over, with three vertical sides, or have a sloping base that rises from the edge of the board to the surface of the board, to take a strap pared to the same profile.
Short lengths of the head and tail edges of boards with squares which are adjacent to the spine and are cut down to the height of the bookblock to allow Greek-style endbands to be sewn to the boards. This type of board preparation would appear to be restricted to Western European imitations of Greek-style bindings (hybrid Greek-style bindings), but has not yet been recorded on a genuine Greek-style binding.
Sewing supports that are placed in recesses cut across the spine of a bookblock and to which the gatherings are sewn.