Table and chair legs, hall trees, the sides of magazine racks, writing desks, etc., are often so designed as to leave no edges parallel with their vertical axes. It often happens, however, that mortises or screw holes must be located at right angles to the vertical axis. While it is possible to lay out such work from a vertical axis, or by other special means, it is usually better:

1. To establish a face side and a joint edge.

2. To lay out all mortises, cuts, or screw holes, and as much of the outline as possible from these two surfaces before cutting them away.