Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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knocking out the groove

The process employed when rebinding a book that was backed in the original binding, in which the bend in each section caused by the backing is removed. In library binding this is frequently accomplished by nipping the book before the sections are separated. In hand binding, one method is to hammer (three) sections together on the knocking-down iron, hut a more gentle (and safer) method is to bend each section individually over the edge of a board thus reversing the hacking fold. In the latter method there is no danger of disturbing the conformation of the paper fibers, as can happen when the section is hammered. (161 , 355 )

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