Tranchefile, raised bands, sewing: the hidden mechanics of the ancient book

The raised bands, cords, and sewing form the hidden mechanics of an old book: what holds the gatherings upright, withstands five centuries of openings, and betrays the era as surely as the binder’s hand. Understanding this framework is to read a volume not just by its cover.

The sewing of the old book, invisible backbone

Before the morocco leather dresses the spine, everything begins with a thread. The binder stacks the gatherings on a sewing frame, then pierces them one by one, looping the thread around vertically stretched supports. These supports are the raised bands, and their nature has changed greatly over time. In the earliest Western codices, sewing was done on genuine animal sinew, then on strips of skin, rolled parchment tongues, and finally on septain, a multi-strand twisted hemp cord. The BnF documents this evolution in its medieval manuscript restoration workshops.

The operation seems mechanical. It is not. A poorly pierced gathering, and the thread will cut through the paper after a few openings. Too much tension, and the spine will warp. Too loose, and the book will gap. This is why hand-sewn bindings by a skilled workshop can endure four centuries, whereas industrial bindings of the 20th century sometimes fail within decades.

Sewing on raised bands or on tapes: two philosophies

For centuries, nearly all books bound in Europe were sewn on visible raised supports at the spine. Then came the 19th century, its industrialisation, its production pace, and with them the tapes sewing method, which transformed the economics of the workshop. Tapes, wider and quicker to attach than cords, allowed a volume to be sewn in far less time. The downside: they are no longer laced into boards but cut flush and glued into the pastedowns. The assembly gains speed, but loses longevity, especially for large formats.

Sewing on raised bands remains the gold standard for fine bindings. The thread wraps around each band with every gathering, creating a flexible yet durable hinge. As the spine rounds, the bands form the characteristic ridges that structure the compartmentalisation of the raised bands. The great binders of the 19th century never abandoned this technique for their luxury commissions.

How many cords? Format dictates the rule

The number of cords is never decorative. It depends on the format, the weight of the book, and the length of the spine. Workshop practice dictates that each cord should support an equivalent portion of gatherings; otherwise, the mechanics become unbalanced. In general, European production from the 17th to the 19th centuries observes the following:

• Three cords on very small formats, duodecimo and sextodecimo, where the spine is short.
• Four cords on common octavo, the predominant format of French literature since the 16th century.
• Five cords on quarto and fine octavo bindings, a classic balance.
• Six cords or more on heavy folios, Bibles, atlases, and legal collections.

The widespread adoption of the octavo format, popularised by Aldus Manutius in Venice at the very beginning of the 16th century, established for generations the standard of a four- or five-cord spine. If you encounter a 17th-century octavo with six cords, be wary or curious. It is either a bibliophile’s whim or a late rebinding by a workshop eager to make an impression.

True cords, false cords: recognising deception

Since the 19th century, false cords have gained ground. In these bindings, the gatherings are sewn onto cords inserted into grooves of a hollow back, producing a smooth spine initially. The binder then glues strips of board or leather over these to mimic the raised cords of genuine bindings. The result is deceptively similar to an old binding, but the structural function is lost: they are merely decorative bosses.

To distinguish them, open the book flat and examine the inside of the spine if the binding allows. A true cord runs from board to board, passing through the gatherings; a false cord stops at the spine. Another easily visible clue is the perfect regularity of false cords, aligned with precision, whereas true cords always show minute irregularities, traces of handwork. On 17th-century Jansenist bindings, false cords never appear. On common editions from the Second Empire, they almost always do.

The headband, that tiny embroidered cord that changes everything

At the very top and bottom of the spine, an embroidered cord emerges between the compartments. This is the headband. Its function is twofold: it reinforces the assembly of the gatherings at the head and tail, where mechanical stress is greatest, and it strengthens the joints, those vulnerable areas whenever a volume is pulled from the shelf. The glossary of bookbinding lists several types, ranging from a simple wrapped thread to multi-level embroidery.

The materials vary. Silk for deluxe bindings, linen or hemp for standard ones, dyed thread for refined commissions. Some royal headbands from the 17th century use gold or silver thread, traces of which can still be seen in armorial bindings preserved at the BnF. Hand-embroidered headbands come in several styles:

A missing, crushed, or mechanical headband made of simple glued paper is among the quickest indicators to assess a binding. On the market, an 18th-century volume with its original headbands intact is worth significantly more than the same title whose joints have been restored in the 19th or 20th century.

Endpapers, pastedowns, and linings: the inner casing

Once the gatherings are sewn and the headbands are in place, the bookbinder adds the endpapers. These are the blank or marbled sheets that open and close the volume, serving both as physical protection for the first gathering and as a flexible zone for the movement of the binding. Before the 18th century, endpapers are mostly white or patterned paper. The rise of marbled paper, imported from the East via Venice and later produced in France from the 17th century, changed the game: it became the standard endpaper in the second third of the 18th century.

The pastedown is the half of the endpaper glued to the inside of the board. It conceals the passage of the raised bands on the board and provides the first interior impression. In fine bindings, this pastedown is replaced by a lining of luxury material: gilt paper, embroidered silk, or sometimes leather lined with another leather. These linings almost always indicate a high-end commission, and their condition heavily influences valuation. For further reading on terminology, see our complete anatomy of the ancient book.

Reading an old book like a mechanic

When you pick up a volume, first look at the spine. Count the raised bands, assess their regularity, and check whether they are real or false. Then open to the first endpaper and gently pivot the boards: if the spine cracks sharply, the sewing is likely damaged. If the gatherings fan out without tension, the sewing is loose or the spine glue has dried out. A good binding is recognised by its clean opening, without harsh resistance or floppiness.

1. Step 1. Count the raised bands on the spine. Note their number, regularity, and prominence.
2. Step 2. Examine the head and tail with a loupe. Is the headband hand-sewn, machine-made, or missing?
3. Step 3. Open to the first endpaper. Identify the paper type—white, marbled, diced—and its probable period.
4. Step 4. Pivot the boards to 90 degrees. The spine should move smoothly without cracking or warping.
5. Step 5. Inspect the sewing through the gap between gatherings. Linen thread, visible cords, or ribbons: each clue dates the work.

In the bindings featured in our catalogue, these checks always determine the valuation. A Bradel binding with its original headband commands a different price than a later rebound copy. If you are unsure about an inherited volume, our team can examine it without obligation, or you may send it directly via our sell and valuation page.