Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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zero angle

A completely flattened configuration of the fiber bundles of a skin, in which the fibers are not distributed in the customary complex three-dimensional network, as in leather, but are aligned into layers parallel to the grain and flesh surfaces of the skin. A true zero angle is probably not attainable, although PARCHMENT and vellum generally have a very low angle. This type of configuration results from drying a skin under high tension. (291 )

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