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

ASSEMBLY OF PANEL AND FRAME 53 Fig. 19 (continued). 13. Variation of 12 with mixed cut on front face. Slotted joints . 14. Slotted joint, mitred on both faces. 15. Slotted joint, cut square on both faces. 16. Slotted joint mixed cut on front face, cut square at back. 17. Slotted joint, mixed cut on both faces. 18. Slotted joint, mitred at front, cut square at back. Being simple to produce (largely with a saw) and permitting a variety of moulding across the entire surface, this type of joint rapidly became a standard in the 16th century.