Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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gape ( gaping )

A condition in which the covers of a book are not parallel but are further apart at the fore edge than at the spine, i.e., the book does not close properly. Gaping, or yawning, as it is also called, may be caused by improper insertion of folded material without adequate stubbing; by improper covering or casing-in technique, in which the case is in effect too small for the text block or the covering material is drawn on too tightly; or, in the case of vellum books or bindings, by the absorption of moisture, which causes the vellum covers to warp. (99 , 236 )

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