Here's a video clip (http://creative.gettyimages.com/source/Film/filmresultsmain.aspx?source=quickSearchFilm&txtSearch=1939+camera&doRF=True&doRM=True&usePrefs=False) I ran across that shows people being televised by one of RCA's experimental iconoscope cameras (http://www.earlytelevision.org/rca_iconoscope_camera.html) to a TRK-12 television receiver at the 1939 World's Fair. This is just a watermarked preview of a commercial stock footage product, but it's worth seeing. I haven't seen this particular footage anywhere else.

--Dave

There was no sound on that clip and no real view of the TRK-12 but it does look familliar. I think this was part of a documentary on PBS many years ago about the 1930s. The scene at the world's fair where the kid performs in front of the camera was part of it.