In February 2019, the Lab received a unique item at the special collections’ meetings for the UC Libraries, a Book of Hours (ms.37) from 1475 from the Archives and Rare Books Library.  I was so excited when this book came into the Lab.

This 15^th century Book of Hours was in poor condition and in need of conservation treatment. Not only was the binding structure failing and the text block broken in half, but this book was also heavily used as a teaching tool at the ARB library, and in its current condition it could not be safely handled. This was the perfect project for Ashleigh and I to collaborate.

From the beginning, it was decided that in conjunction with the conservation treatment of the Book of Hours, I would create a book model like the original Book of Hours, to be used as a teaching tool in the ARB library collection. In addition, the model would have a leather chemise, a common feature in some Book of Hours of the time.

Now here is where this story begins with the model of the Book of Hours. Often, here in the lab, we all create book models for various reasons: to learn about a new treatment, test different treatment options, to understand how some materials work together, and as teaching tools.

As a teaching tool in the ARB library collection, this model needed to resemble the original Book of Hours in its structure and materials used.

The primary goal for this model was to show how a Book of Hours was historically built, its sewing structure, the materials used, and also to provide the ARB library with a book that could be easily handled by students and scholars.

Once the treatment for the Book of Hours was fully established and confirmed with the ARB curator, I was able to start working on the book model. I will save you form reading about all the different steps of making the model, but here are the main features of model:

Text block

• Primary support – Khadi paper white cotton rag
• Endsheets with leather hinge – Two bifolios of calligraphy goat parchment skin wrapped along the spine edge with a hinge of Allum tawed leather (later would be used as pastedowns)
• Sewing – Sewn on three double raised cords with a linen 18/3 thread. The dimensions of the text block and sewing holes, were guided from the original sewing holes of the Book of Hours.
• Endbands – Primary conservation endband with the bead on the spine, and secondary endband with the bead on the text block.
• Spine linings:
  • Reversible layer of Usu Gami thin and Zen Shofu wheat starch paste.
  • Slotted Airplane cotton cloth with flanges to be used as board attachments.

Cover

• Boards – Oak wood
• Board attachment – Boards were laced with the sewing supports through carved channels
• Covering material – Full alum tawed leather binding with removable chemise
• Clasps – Brass tension clasps (these were created in-house by Chris Voynovich, and he did an amazing job).

There was no evidence that the original Book of Hours had clasps, but the curator requested tension clasps for the book model. Clasps were common in the 15^th century bookbinding, and this would provide the students with the experience of handling a book with clasps and allow them to understand their function.

The curator also requested that one of the pastedowns be kept unattached, so the students could see how the boards were attached to the text block and that they were wooden boards.

In addition, I created a removable chemise, also requested by the curator of the ARB library. In some Books of Hours, it was common to have a leather chemise, but most often they were not removable. The chemise was created from a vegetable tanned goat split skin.

Stay tuned for a future blog post where we will dive into the conservation treatment and research we did on the Book of Hours (ms.37).

Catarina Figueirinhas (UCL) —- Assistant Conservator

Photographic Documentation by Catarina Figueirinhas and Jessica Ebert