A sewn structure in which the gatherings are not sewn to sewing supports, but are held together by thread only which passes from one gathering to the next.
The edge of the bookblock opposite the fore-edge where the spine-folds of the gatherings, sewing supports, external endband tiedowns and spine linings will be found.
The means by which boards are attached to sewn bookblocks by adhering the slips of sewing supports to either the internal or external surface of the boards.
The sewing supports are spaced at markedly different distances from each other in a manner that follows no recognisable pattern. This is usually the sign of a clumsy made book.
The parts of a sewing support, endband core or stitched thong which extend beyond the thickness of a bookblock and may be used to attach boards or covers to the bookblock.
The parts of a sewing support, endband core or stitched core which extend beyond the thickness of a bookblock and may be used to attach boards or covers to the bookblock.
The shaping of the edges of the spine of a bookblock to accommodate both the swelling created by the sewing thread and the shape of the spine edges of the boards. Backing joints could be created either by lacing boards tightly onto the sewing-support slips and pulling them shut, or by putting the book between backing boards in a backing press and hammering them into shape with a backing hammer. Many bookblocks, however, do not have shaped backing joints, and these should be described as having flat joints.
Small loops of thread, parchment or alum-tawed skin used to secure an unused endband slip either to the kettlestitches of a sewn bookblock or to the nearest sewing support slips on the same joint.
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.
The sewing supports are arranged so as to create panels of equal size along the spine. This arrangement is often found before the introduction of the vertical storage of books, but can still be found afterwards.