Progress is surely being made with this unit.
But let us follow through the process:
First let me say that the artisan of yesterday, who ever he was, he did a fine job of cutting this glass.
He didn't have the nice pivotal easy handled cutter we can use today.
Nor did he have an electric grinder for smoothing the edges. His was a file for smoothing the edge, lots of hand work!
His only choice for holding the glass together was the lead method.
Two choices today.
The lead method: by which strips of channeled lead are stretched to make rigid, then soldered at the meeting points once wrapped around the glass, and cemented.
The copper-foil method introduced through Louis Tiffany, which has been greatly modified and improved since introduction! The foil, now with adhesive on the back, wraps around each piece of glass, then is soldered into place. Lots of steps are eliminated, plus for me it is a lot easier to reinforce. I use a flat metal that slips in between the glass, giving the total unit added strength.
All this now explained.
After I trued up the pieces of glass, they were cleaned of their cement deposits, then foiling begins.
Just as you imagine the foil is wrapped around the glass then smoothed with a fid (straight stick) so it is adhered well.