When loose leaves are replaced the greatest care should be taken to make
sure that they do not extend beyond the edge of the book. If this
occurs, it shows careless or inexperienced mending.
LOOSE LEAVES may be inserted in several ways:
(1) If the leaf fits exactly into the book, it may be tipped in by
applying paste to one-eighth inch of its inner margin.
Place the loose leaf in the book, the outer edge even with the book,
and rub down the pasted inner margin against the next leaf with bone
folder.
Put the book in press until dry.
Illustrations may be tipped-in in this way when it is desirable to
preserve them.
(2) If it is found by measuring that the leaf when inserted, will
extend beyond the edge of the book, fold the leaf at the inner
margin over a ruler edge, or other straight edge, slightly more than
one-eighth of an inch, thus making a hinge. Apply paste to this
hinge with the finger. Place leaf in the book and push well back;
rub the little pasted hinge down with bone folder, being careful to
leave no free paste.
(3) In case the quality of the paper of the leaf to be inserted will
not stand the tipping-in process, or is badly worn at the inner
margin, it may be inserted by a guard. Fold a half-inch strip of
onion skin paper, lengthwise. Apply a thin coat of paste to the
outside of this strip. Attach half of the strip to the inner edge of
the loose leaf, and the other half to the adjoining page in the
book, close in by the fold. Trim edge of leaf if it projects. Put in
press until dry.
Do not use gummed muslin for this work. It destroys the chance of proper
rebinding and detracts from the appearance of the rebound book.