Public demonstration of (one-way) video telephone occurred this date in 1927, when then Secretary of Commerce Herbert Hoover made the call from Washington DC to AT&T in New York, where it was viewed by AT&T executives.
http://www.corp.att.com/history/television/
http://www.earlytelevision.org/bell_labs.html
Looks like about 50 scanning lines (assuming they were horizontal).
Does anyone know the actual count?
[Update of a thread originally posted 4 years ago]