Several variations of the “case” are possible.
(A). The simplest is to cover the outside corners with vellum. If
this is to be done, the vellum corners are to be applied before the
cover paper. The width of the corner piece, exclusive of the laps and
measured on a line bisecting the right-angle, should equal the width of
the strip of vellum which shows at the back. This rule holds true in
all high class bindings such as morocco, Levant, calf, etc. (See Plate
LIV.)
By experimenting a little, a pattern (trapezoid) may be made for the
corner pieces by which to cut them. (See Plate LIV.) Plan these pieces
to extend under the paper at least ¼ of an inch.
[Illustration: PLATE LIV. Diagram to illustrate the size of separate
corners, also method of cutting them.]
After the cover paper has been cut in rectangular shape, according to
the original plan, the two outside corners should be trimmed to allow
the proper amount of vellum to show. This may be accomplished in one of
two ways. Using the same pattern as for the vellum corners, fit its two
opposite non-parallel edges as close to the corner as possible and cut
along the inside edge of the pattern. Or, one may place the newsboard
on the paper and trace around it, lay off the size of the finished
corner and cut on the resulting oblique line. After the vellum corners
have been pasted on firmly, place the cover paper carefully and paste
it on as already described.
(B). After the “case” is completed in either of the two ways described,
it may be decorated with lettering or by the application of other
design. In this instance the suggestions given in connection with the
portfolio should be followed.
(C). The entire “case” may be covered with vellum. Generally a cloth
covering is not desirable on a hand-sewed book, but if for a special
reason one is to be used, have a single piece of vellum cut large
enough to cover both back and sides. After finding the correct distance
between the two pieces of newsboard, lay them on the vellum, in the
manner already described, trace around them, and complete the “case” by
pasting.