Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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damping stretch

The alteration in the dimensions of a sheet of paper when it becomes wet. Since paper fibers increase more in diameter than in length when moistened, the dimensions of the sheet will increase more in the cross direction than in the machine direction. This is one reason why it is essential that the "grain" or machine direction of book papers be parallel to the binding edge of the book. Handmade papers, when moistened, generally expand more or less equally in all directions, as these papers have no definite grain direction. (17 )

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