No. 60. A double-tongue miter is made by cutting on the adjoining edges tongues which engage in each other. It is used in high class joinery, on members that join lengthwise of the grain.
Fig. 268-60 Double tongue miter
No. 61. A stretcher joint is a slip joint in which one or both sides is mitered. It is used in frames for stretching canvass for paintings by driving wedges from the inside. Two forms are shown in 61a and 61b.
Fig. 268-61 Stretcher