I discovered a film on youtube about Gonzales Camarena. Unfortunately, I do not understand Spanish, so I mainly picked up references to things I already know. If comeone can summarize in English, it would be very much appreciated!
http://www.youtube.com/watch?v=FLfUE...eature=related
It starts with discussion of Baird and Farnsworth. It does show use of color filters and a wheel. It also has some reference to Chicago, which was very unexpected! Could someone at least summarize that part in English?