the recessed portion
marked B and the two pieces being secured in their respective positions
by screws.

Fig. 212 shows a dovetailed scarf joint. This is a variation of Fig. 211,
the length of the dovetail lap being from 6 ins. to 8 ins. in length.

Fig. 213 is an illustration of a joint designed to resist a cross strain.
The face side is left flush, whilst the underside is assisted by an iron
plate. The joint is secured with nuts, bolts, and washers. This type of
joint is frequently used for joining purlins in roof work; the iron plate
on the underside is in this case omitted.

Fig. 214 is designed to resist both tension and compression and is an
excellent joint for all purposes. The joint is brought together by using
folding wedges as shown in the centre.

[Illustration: Fig. 211.--Half-Lap Scarf Joint for Light Timber.]

[Illustration: Fig. 212.--Dovetailed Scarf Joint.]

[Illustration: Fig. 213.--Plated Scarf Joint Used in Roof Work.]

Fig. 215 is a variation of Fig. 214, and it will be noticed that tenons
are provided on the face and underside to resist cross strain. Probably
this is one of the best varieties of the scarfed joint. Unfortunately,
however, its production is somewhat costly, and this may be the reason
that it is not more universally used. Folding wedges are used to secure
the two pieces in position.

[Illustration: Fig. 214.--Tenoned Scarf Joint.]

[Illustration: Fig. 215.--Double Tenoned Scarf Joint.]

[Illustration: Fig. 216.--Scarf Joint with Vee'd ends.]

Fig. 216 is a scarfed joint with undercut vee'd ends which prevent the
joint from lipping up or down or sideways. It is a useful joint, calling
for careful setting out and accurate craftsmanship. Folding wedges are
used in this case to draw up and secure the joint.

Fig. 217 is a "fished joint," and the following difference between a
scarfed and fished joint should be noted. A fished joint need not
necessarily reduce the total length of the beams to be joined, and fish
plates of wood or iron (or a combination of both) are fastened at each
side of the joint. In a scarf joint all surfaces are flush. In Fig. 217
the beams are butt-jointed and secured by wooden plates and iron bolts.
The upper plate is let into each beam, and the lower plate is provided
with two wooden keys to prevent the beams sliding (or "creeping") upon
the lower plate. Iron nuts, bolts, and washers are used to complete the
joint.

[Illustration: Fig. 217.--Fished