Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The process of attaching index tabs to the leaves of a book, or the cutting, stamping, gouging or printing of indices in the fore edges of books. When tabs are used for the index, the top one is cut larger than the others when the steps are small, because. being at the top of the leaf, a small step may break away during use unless it is large enough to be secured firmly to the leaf. In blankbook tab indexing, under average conditions, certain letters of the alphabet will have more accounts listed under them than will other letters. Analysis of this had led to the development of tables that give the proper number of pages to meet the requirements of each letter. Thus, more pages are required for the initial letter S, followed by B (or vice versa in some cases), then H, and so on down to X, which requires the fewest.

Indices for reference books are usually of the thumb type, while blankbooks generally have cut through or tab indices.

In indexing format, a ONE-LETTER INDEX usually consists of 24 letters or divisions, while a TWO-LETTER INDEX has 13 divisions. Some indices have supplementary indices for the five vowels cut into the leaves of each letter of the main index.

Although these terms are used, an index may be made with any number of divisions and leaves to each division, or may be cut through the entire book. (264 , 343 )

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