The rounded space formed behind the spine of a case-bound book.

A strip of board in the centre of a case to stiffen the spine

That space on the spine of a case bound book between the block of the book and the case binding.

That part which forms a hollow in the spine when opened

The part or space of a case binding between the textblock spine and the inside of the cover spine. nner Hinge Fold of the channel lying between the two halves of an endsheet where the textblock is attached to its cover (case). Also called a front hinge and inner joint. eaf Single sheet of paper or half of a folded sheet of paper. ( LBI Standard, Glossary, p.15)

A paper tube stuck to the spine of a book, to which the covering material is attached. The resulting hollow back allows a freer opening for sections of stiff paper, or for books in which entries are to be made, and allows books bound in stiff material such as vellum and buckram to open more freely.