This section is from the "Elementary Woodwork" book, by Frank Henry Selden. Also available from Amazon: Elementary Woodwork for Use in Manual Training Classes.
The stock for this joint and the finished sizes are the same as for Lesson 19 (Halved Cross).

Fig. 119. Slip Mortise and Miter.
This joint is simply a combination of the joints shown in Figs. 70 and 115. By carefully reviewing Lessons 21 and 36 you should have no difficulty in making this joint. This joint should be thoroughly clamped as shown in Figs. 77, 78, and 79. Place some paper between the blocks at the face and back of the joint to keep the glue which is forced from the joint from sticking the blocks or clamps to the joint.
This is a strong joint for frames, etc., but is not often used, because of the time required to make it.
 
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