Here's the top of the lamp showing the damage.
When repairing a lamp, its always better to keep the pieces which broke off. Here are several .. I had to cut only one new piece.
After I cleaned off all the old solder and foil and foil residue from the loose pieces, I added new copper foil as shown here.
Tugging off some of the old solder and foil. In order to build on existing pieces, the foil and solder always have to be refreshed.
When it can't readily be removed, I melt it off with a hot soldering iron as shown.
Here I'm using one of the original pieces as a template to trace a new one which was missing. I had some glass in inventory which was a close match in color and in luminosity.
Then I ground the edges ..
I'm preparing for the soldering of the pieces by adding new copper foil around the upper edge of the opening as shown.
Several of the pieces were still in place but they were a little bit loose. Rather than take a chance, I removed, cleaned off, and replaced those as well. My goal is always to do a strong repair.
After I added in all the pieces for the perimeter of the opening, I soldered on a single piece of wire which went completely around it. This is to reinforce the pieces and support the weight of the dome.
This lamp has an unusual feature .. Two caps! One goes on the bottom of the glass, the other on the top.
Since the bottom cap is the one that bears all the weight of the lamp, I concentrated on strengthening it. Here I'm using a brass brush to clean off the oxidation around the lip.
Then I melted on a thick bead of solder around the lip as shown. Also shown are short lengths of flat, braided reinforcement wire. I'm in the process of "tinning" them. This means I coated them with liquid "flux" and then added a thin layer of solder, which, when melted, will adhere to the lip of the cap.
And here's the cap with the reinforcement wire spaced around the perimeter. I've added several since these will help support the weight of the dome, along with the wire already in place on the inside.
View from inside the dome. Note the "legs" of reinforcement wire which stretch into the dome. These are very strong and supportive.
After I thoroughly reinforced and strengthened the underneath of the cap, I did the same to the top as shown. I added strong beads of solder around the edge. These beads connect the cap with the glass. This solder will not be visible when the upper cap is in place.
Here's the lamp, strongly repaired and ready for many more years of enjoyment!
Thank you Maomi, Gregory and Kristin for traveling all the way from Queens, NY with your beautiful lamp. It was a pleasure repairing it for you!