Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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double two sheets on

A method of sewing a book on tapes that is reputed to give still greater strength than the ALL ALONG method. Each section is sewn "two sheets on" with the preceding section, resulting in each section being sewn to the sections both above and below it. This gives greater holding power because two threads pass through each section; consequently, if one thread breaks the other still holds the section. Unless the first and last sections are sewn all along, however, the weakness of this method is that these sections, which receive the greatest strain when the book is being used—particularly the first section—are not held very securely. In addition, not all of the sections are held by the kettle stitches. (196 )

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