e other as at A
A.

[Illustration: Fig. 335.--Circular Frame in Two Thicknesses.]

[Illustration: Fig. 336.--Circular Rim in Halved Segments.]

Fig. 338 shows how to begin to put the work together. To continue this,
fit other segments in position and screw them to D and E respectively.
The completed work is illustrated at Fig. 335.

[Illustration: Fig. 337.--Board Marked for Circular Jointing.]

[Illustration: Fig. 338.--Putting Circular Work Together.]

[Illustration: Fig. 339., Fig. 340. Method of Building up
Semicircular Head of Door Frame.]

Fig. 336 shows a circular rim, or curb, made of segments which are halved
together. This method is suitable for heavy work, where the timbers are
of considerable size. The halvings are cut on the ends of the segments
to any convenient shape or bevel, each one being marked so as to fit its
fellow.

[Illustration: Fig. 341.--Part of Laminated Table Frame.]

[Illustration: Fig. 342.--Half of Laminated Core Box.]

When extra length is required, semicircular or circular work is built up
out of four or five thicknesses of wood, and the method is called
laminating. The method of building up the semicircular head of a door
frame by this method is shown at Figs. 339 and 340.

The shaped framing for kidney-shaped writing tables and similar classes
of work is built up by laminating pieces of 3/4-in. or 1-in. wood, after
which the face side is veneered so as to hide the glued joints. Fig. 341
shows a sketch of one quarter of an elliptical table frame levelled up
and ready for applying the veneer.

LAMINATION.--If we apply to the dictionary for the word "lamination," we
find that lamellar structure is the arrangements in thin plates or layers
one over the other, usually having the end joints alternating, and it is
a condition which allows of cleavage in one direction only. This method
is used for nearly all descriptions of free or irregular curves, such as
sweeps, bends, ogee shapes, and segments of circles. The timber is marked
out in suitable lengths, rough-sawn and then planed true on the face,
glued together, and when set the sides are cleaned up to the required
shape. It is one of the strongest methods of construction, and
necessarily costly. Pulleys, pulley rims, and a hundred and one other
jobs are built by this method.

Fig. 342 shows one half of a core box built by this method, ready to be
worked to the required shape.

MISCELLANEOUS JOINTS

Weather boards