The process employed in attaching silk doublures.
A special technique is required because adhesives
cannot be applied directly to silk as they would
penetrate the material. A piece of silk larger
than the space enclosed by the turn-ins and
leather joint is laid on a piece of paper the
exact size of the enclosure. The edges of the silk
are turned over the paper and glued to the back.
The paper is then glued to the board. The silk is
secured only at the edges and is otherwise free
(like a drum), being drawn taut but not glued
down. If the DOUBLURE extends to
the very edge of the board, the enclosure is
filled in with thin board to bring the board
surface up to the level of the turn-ins and joint.