I think this clockwork-in-a-vacuum was preceded by eidophors: a projector with a spinning disc of oil that has an image drawn by an electron gun, that is then i

I think this clockwork-in-a-vacuum was preceded by eidophors: a projector with a spinning disc of oil that has an image drawn by an electron gun, that is then illuminated by an arc lamp. https://www.youtube.com/watch?v=5783jPTKzjk https://www.youtube.com/watch?v=5783jPTKzjk