What a Joint Groove does on an Adhered-Boards Binding

The opening of an uncovered adhered-boards binding without a joint groove. Notice where the board naturally rests under its own weight.

The opening of an uncovered adhered-boards binding with a joint groove. Here, the board opens more than 180 degrees.

The traditional reason given for using a joint groove is to allow the covering material to bend backwards in a more gentle manor, so that the board swings opens more widely without bunching up on itself. This was part of the reason the joint groove made a comeback in the early years of the twentieth century on leather bound books, along with the split-board structure, as a way to use thicker leather in order to make books more durable.

This, however, is only part of the story. Adhered-boards structures are very common in early nineteenth century American leather, paper and cloth bindings. Instead of laced boards, the slips are pasted to the outermost endleaf.  Then the boards are adhered to this for about an inch or so. After this is dry, the unpasted area of the endleaf is torn off, and the boards can be trimmed to size.

As you can see in these images, the joint groove significantly affects the opening, even without any covering material. Note that it is the same book in both images, with the front board placed tight, and the back board with a joint groove.The difference surprised me. There is always something new to learn: this is what keeps me interested in the history and practice of bookbinding.

One thought on “What a Joint Groove does on an Adhered-Boards Binding

  1. Rita Udina

    Thanks for the post Jeff!
    Yes, there’s always something to learn, and it is certainly surprising how the structural changes modify the whole thing, even when it’s only some paste, threads and paper…
    We love bookbinding!
    :-)

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