Title: 1939 New York World's Fair
Content:  Sarnoff, then president of RCA and a strong advocate of television, chose to introduce television to the mass public at the RCA pavilion. As a reflection of the wide range of technological innovation on parade at the fair, Franklin D. Roosevelt's speech was not only broadcast over the various radio networks but also was televised along with other parts of the opening ceremony and other events at the fair. That day, the opening ceremony and President Roosevelt's speech were seen on black and white television sets with 5 to 12-inch tubes. 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 
Title: 1939 New York World's Fair
Content:  200 television sets scattered throughout the New York metropolitan area. In order to convince skeptical visitors that the television sets were not a trick, one set was made with a transparent case so that the internal components could be seen. As part of the exhibit at the RCA pavilion, visitors could see themselves on television. There were also television demonstrations at the General Electric and Westinghouse pavilions. During this formal introduction at the fair, television sets became available for public purchase at various stores in the New York City area. After Albert Einstein gave a speech that discussed cosmic rays, the fair's lights were ceremonially lit. Dignitaries received a special Opening Day Program which contained their names written in Braille.
Title: 1939 in television
Content:  International Exhibition in San Francisco. ; RCA, General Electric, Dumont and others begin selling television sets to the public in the New York City area. Screen sizes typically range from 5 to 12 inches, and Dumont features 14-inch and 16-inch models. Prices start at $200 and go as high as $1000. ; April 30 – Franklin D. Roosevelt, appearing at the opening ceremony of the 1939 New York World's Fair, becomes the first President of the United States to give a speech that is broadcast by television. ; May 17 – The first baseball game (Princeton University vs. Columbia University) is broadcast by television, from Baker Field in 
Title: 1939 New York World's Fair
Content:  featuring his ceramic sculptures for the General Motors Building, American Imports and American Exports. Nylon fabric, the View-Master, and Scentovision (an early version of Smell-O-Vision) were introduced at the Fair. Other exhibits included Vermeer's painting The Milkmaid from the Rijksmuseum in Amsterdam, a streamlined pencil sharpener, a diner (still in operation as the White Mana in Jersey City, New Jersey), a futuristic car-based city by General Motors, the first fully constructed computer game, and early televisions. There was also a huge globe/planetarium located near the center of the fair. Bell Labs' Voder, a keyboard-operated speech synthesizer, was demonstrated at the Fair.
Title: Ray Forrest
Content:  23-year-old junior radio announcer at NBC, was not present at the opening of the New York World's Fair on April 30, 1939, when President Franklin D. Roosevelt and David Sarnoff, the president of the Radio Corporation of America, NBC's parent, inaugurated regular television programming with a broadcast over NBC's experimental station, W2XBS. Indeed, for months the station employed no announcers, recruiting them from NBC Radio staff as the need arose, a process that so irritated the radio network's chief announcer that, by the fall, he persuaded the station to stop pestering him and make one of his six junior announcers the 
Title: David Sarnoff
Content:  division at the time, The National Broadcasting Company (NBC). The first television broadcast aired was the dedication of the RCA pavilion at the 1939 New York World's Fairgrounds and was introduced by Sarnoff himself. Later that month on April 30, opening day ceremonies at The World's Fair were telecast in the medium's first major production, featuring a speech by President Franklin D. Roosevelt, the first US President to appear on television. These telecasts were seen only in New York City and the immediate vicinity, since NBC television had only one station at the time, W2XBS Channel 1, now WNBC Channel 4. The broadcast was seen by an estimated 1,000 viewers from the roughly 200 
Title: 1939 New York World's Fair
Content:  The 1939–40 New York World's Fair was a world's fair held at Flushing Meadows–Corona Park in Queens, New York, United States. It was the second-most expensive American world's fair of all time, exceeded only by St. Louis's Louisiana Purchase Exposition of 1904. Many countries around the world participated in it, and over 44 million people attended its exhibits in two seasons. It was the first exposition to be based on the future, with an opening slogan of "Dawn of a New Day", and it allowed all visitors to take a look at "the world of tomorrow". When World War II began four months into the 1939 World's Fair, many exhibits were affected, especially those on display in the pavilions of countries under Axis occupation. After the close of the fair in 1940, many exhibits were demolished or removed, though some buildings were retained for the 1964–1965 New York World's Fair, held at the same site.
Title: History of television
Content:  on April 30, 1939, with a broadcast of the opening of the 1939 New York World's Fair. In 1937 RCA raised the frame definition to 441 lines, and its executives petitioned the FCC for approval of the standard. By June 1939, regularly scheduled 441-line electronic television broadcasts were available in New York City and Los Angeles, and by November on General Electric's station in Schenectady. From May through December 1939, the New York City NBC station (W2XBS) of RCA broadcast twenty to fifty-eight hours of programming per month, Wednesday through Sunday of each week. The programming was 33% news, 29% drama, 
Title: 1939 New York World's Fair
Content:  1939 World's Fair. ; The Twilight Zone Season 2 episode "The Odyssey of Flight 33" (1961) follows Flight 33 lost in time and briefly in 1939, with a sky view of the World's Fair. However, the pilot incorrectly identifies the location as Lake Success, which actually is in Nassau County, not Queens County. ; In The Simpsons 2003 episode "Brake My Wife, Please", Mr. Burns gives Homer a ticket to the fair as a reward for being the first employee to arrive at work that day. The ticket shown features the Trylon and Perisphere, as well as the opening and closing dates of the fair. 
Title: Television show
Content:  The first television shows were experimental, sporadic broadcasts viewable only within a very short range from the broadcast tower starting in the 1930s. Televised events such as the 1936 Summer Olympics in Germany, the 1937 coronation of King George VI in the UK, and David Sarnoff's famous introduction at the 1939 New York World's Fair in the US spurred a growth in the medium, but World War II put a halt to development until after the war. The 1947 World Series inspired many Americans to buy their first television set and then in 1948, the popular radio show Texaco Star Theater made the move and became the first weekly televised variety show, earning host Milton Berle the name "Mr Television" and demonstrating that the medium was a stable, modern form of entertainment which could attract advertisers. 

Question: what happened at the 1939 worlds fair in regards to television?
Answer: Television demonstrations are held.