There is something about that green film and the electric field that is generated that produce the moving image.
I remember those ads.
Marv is correct. Copper tube being so easy to get is seen probably 99% of the time, and what we used demonstrating to STEM classes. Though bar would make the field appear broader, more visible.
Glad I wasn't called to make it. I machine copper now and then, making spotweld electrodes and fixture plates. Politely, many grades are quite a bear to machine.
...we'll learn more by wandering than searching...
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