This section is from the book "Elements Of Construction", by Charles A. King. Also available from Amazon: Elements of construction.
Intersection Joint. Fig. 101.
Material:
1 piece, a, 6" X 1 1/2" X 7/8". 1 piece, 6, 6" X 24" X -2-".
1. Fitting the joint: Lay the pieces upon each other, as indicated by the dotted lines, at the angle of their intersection, and mark point c upon both pieces. Never measure with a rule in a case of this sort, if it is possible to measure with the piece of wood itself.
2. Connect points c and d across the face of each piece by a distinct knife mark, which will give the cut. With a try-square and knife, transfer the angle to the other side of each piece.
3. Cut carefully to the mark with the backsaw, leaving the mark upon the piece wanted.
4. Block plane the pieces to form a perfect joint at the angle desired.
5. Cut pieces to the desired length.

Fig. 101. - Intersection Joint.
6. Fasten the pieces together by a rub joint.
7. Smooth and sandpaper after the glue has set. This joint is used where it is desired to joint pieces of different widths together without allowing end wood to show. The same method may be used when two pieces of the same or different widths join at any angle.
 
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