Graphical Construction Glossary >> Woodwork. >> Joints >> Twin Tenon
Here is a sketch of a bottom rail of a door. Door mid and bottom rails to the work of keeping the door square. The wide shoulders give a lot of strength to stop the door sagging with age.
Because of their depth a single tennon would take out just too much strength out of the door styles.
Note also that this is known as a Through Tenon because it passes completely through the style. Also note the it uses External wedges to hold the joint together in addition to glue of course.
Also note the Haunch at the bottom of the joint. More about that on the next page
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