Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The lining attached to both the spine of the text block and the inside of the spine of the covering material. It is usually constructed of kraft paper, and consists of a folded sheet, one section of which is glued to the spine of the text block and the other to the covering material. There are many variations of the hollow, however; for example, see: ONE ON AND TWO OFF , or TWO ON AND ONE OFF , The purpose of the hollow is to assist in the opening of the book much in the same manner as th SPRING-BACK of a blankbook, though with much less force. The thickness of the paper used for the hollow depends on the size and thickness of the book and the thickness of the paper and sections of the book. (81 , 261 )

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