My favorite quote from the first article: "The varnish I used is intended for oven-drying at 140 to 150 degrees Celsius. I don't have an oven large enough to fit this coil, so I heated it by applying roughly 20A of direct current to the high voltage winding. I monitored the temperature by measuring the resistance change of the wire."
The solution belies a very deep understanding of the principles involved. Both the heating and the thermal regulation were improvised.
Good night I just wasted so much time...
And that makes two of us...
https://news.ycombinator.com/item?id=6895582
https://ludens.cl/paradise/turbine/turbine.html