Page:De Vinne, Invention of Printing (1876).djvu/165

Rh Books of larger size, made for the lecturn, were bound up in boards—not an amalgamation of hard-pressed oakum, tar, and paper-pulp, but veritable boards of planed wood, which were never less than one-quarter inch, and sometimes were two inches in thickness. The sheets encased in these boards were gathered in sections usually of five double leaves. The sections were sewed on rounded raw-hide bands protected from cutting or cracking by a braided casing of thread. A well-bound medieval book is a model of careful sewing: the thread, repeatedly passed in and out of the sections and around the bands, sometimes diagonally from one corner of the book to the other, is caught up and locked in a worked head at the top and bottom of the back. The bands, often fan-tailed at their ends, were pasted and sometimes riveted in the boards. The joints were protected against cracking by broad linings of parchment.

For a book that might receive rough usage, and that did not require a high ornamental finish, hog-skin was selected as the strongest and most suitable covering for the boards. The covers and the back were decorated by marking them with fanciful patterns, lightly burnt in the leather by heated rolls or stamps, from patterns and by processes substantially the same as- those used in manufacturing modern account-books. For a book intended to receive an ornamentation of gilded work, calf and goat-skin leathers were preferred. The gilding was done with care, elaborately, artistically, with an excess of minute decoration that is really bewildering, when one considers the sparsity and simplicity of the tools in use. To protect the gilding on the sides, the boards were often paneled or sunk in the centre, and the corners, and sometimes the entire outer edges of the cover, were shielded with thick projecting plates of brass or copper. A large boss of