Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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parallel transmittance

The degree to which light beams reflected from an object pass through a material, such as paper, within a predetermined small range of angles. It is measured by means of a standardized instrument designed specifically for the purpose. Parallel transmittance is important in determining the transparency of transparent papers, i.e., the more parallel the light beams, approaching 0° angle, the more transparent the paper. (17 )

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