compensation guard
A thickness of linen or paper, usually the latter,
bound into a volume to compensate for the
thickness of folded maps, charts or other bulky
material within the text block, or pocket
material, so as to incorporate such material
without distorting the shape of the book. They are
sometimes made by binding in a full section of
blank leaves placed ahead of the bulky material,
and then cutting out all except a narrow portion
after binding. The more common method, however, is
to bind in folded strips of guard paper when the
book is to be sewn through the folds, or strips of
paper when the book is to be oversewn or otherwise
sewn through the sides of the leaves. (102 )
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