(Sunday, April 30, 1939, 3:12 p.m. EDT) — Franklin D. Roosevelt became the first U.S. President to deliver a speech on live television today as he officially opened the 1939–40 New York World’s Fair at Flushing Meadows–Corona Park, a public park in the northern part of Queens, New York City.

NBC used the event to inaugurate regularly scheduled television broadcasts in New York City over their station W2XBS (now WNBC). An estimated 1,000 people viewed the Roosevelt telecast on about 200 television sets scattered throughout the New York metropolitan area.

Video: 'PBS Documentary "Television" - Episode 3 of 8' (Apr. 30, 1939, at 35:01)