What is the primary bibliographical function of a 'deckle edge' when evaluating an early modern book?
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Correct answer: A rough, uncut edge proving the book's sheets were never trimmed by a binder
A deckle edge is the natural, uneven, and feathered edge of a sheet of handmade paper, formed where the liquid pulp seeps under the wooden frame (deckle) of the papermaking mold. When a book is bound, binders often trimmed these edges straight, occasionally cutting into text margins. Finding an untrimmed deckle edge means the book retains its original sheet dimensions, which is vital for calculating its true format.
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