Back in the late 90s, there was a collector in South France named Karoll, who traded me a French glitter for a Florence Art. He introduced me to boilers, and mailed me hand-drawn illustrations of lamps he'd seen. This is the front page image to a web site he planned to create, featuring photos of French glitter lamps. Alas, he sold a lot of his collection and vanished off the radar.
Wish I could reinstate this and complete it, but I know less than zero about web pages or design. I do have a lot of photos of French lamps, though, and other European vintage lava and glitter. Would be a fun place to picture boilers, too!