Frames and supports in 15th and 16th-century Southern Netherlandish painting

CHAPTER II 52 Fig. 19 (continued). 7. Variant (rare) of joint no. 8. 8. Mortise and tenon joint, full mitre at the front, cut square at the back, and with stub tenon (rare). 9. Specific assembly of the lower corners of frames where the rail has an inclined sill, and where the tenon is on the rail. This is a variant on no. 4, with the tenon shoulder advanced at the front as far as the moulding on the stile, and the moulding on the stile sitting at an incline on the sill . Cut square at the back, as in no. 4. 10. Variant of the previous joint, but with the tenon on the stile and the mortise on the rail. The tenon shoulder is angled to the incline of the sill. Joinery-wise, this is a much simpler solution than 9. Dovetail joints . 11. Half-dovetail joint, mitred on both faces, half-dovetail on rail. The dovetail is inclined only towards the back, as an incline in the front – which was moulded – would have seriously weakened the structure. 12. Variant of 11. Tenon on stile, mitred on the front and tenon shoulder cut square at back.