Harry Moore found a 1933 program schedule for television broadcasting at WILL, the radio station of the University of Illinois
Daily Illini, May 27, 1933
He found similar listings for dates in March, April and May of 1933. We don't know what the television programming consisted of, or any details of the transmissions.
Urbana Daily Courier, May 9, 1933
Comment from Doug McDonald on 9/10/2024:
I talked tonight to two WILL engineers, one of whom has studied the station's history, and rescued some documents from when they intentionally threw out most of the station's history. They are quite sure that WILL never ever transmitted mechanical television, and they think the mention was likely a show about how "television is coming".