Extending lampsThe style of lamp pictured below has always been one of the more popular items that my dad used to make. Its handy for positioning the lamp where you want it.
Its not perfect though. There's a knob for tightening near the pivot on the wall, and that knob needs to be tightened very hard for the lamp not to droop downwards. Its with a wooden screw thread, of course. I think a metal screw, though not as nice looking, would have worked better for applying a large clamping force without turning the knob so hard.
My friend Ron Walters has also made some scissors extending lamps -- less ornate but more engineered.
And another lamp. This one is much simpler, but easier to adjust. Although it doesn't look as pretty as the other lamp.