guide boards
A technique employed by some bookbinders when
trimming with the plow, in which two binder's
boards, each about 1/2 inch larger than the leaves
of the book, are tipped on, one to the front
endpaper with its top even with the trimming line
at the head of the text block, and the second
tipped to the back endpaper with the edge even
with the trimming line at the tail. Guide boards
are used to control the squareness of the book in
the lying press and to prevent crushing of the
shoulders of the text block when the press is
closed on it. (196 )
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