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[[Image:Roger_Federer.jpg|thumb|left|{{#ifexist:Template:Roger Federer.jpg/credit|{{Roger Federer.jpg/credit}}<br/>|}}Roger Federer, a professional tennis player, hitting a forehand against James Blake in the quarterfinals of the 2006 U.S. Open.]]
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<small>
'''Tennis''' is a sport played between either two players ("singles") or two teams of two players ("doubles"). Players use a stringed racquet to strike a hollow rubber ball covered with felt over a net into the opponent's court. In some places tennis is still called '''lawn tennis''' to distinguish it from ''real tennis'' (also known as ''royal tennis'' or ''court tennis''), an older form of the game that originated in France in the Middle Ages and is played indoors on a very different court. Originating in England in the late nineteenth century, lawn tennis first spread throughout the English-speaking world, particularly among the upper classes. Today tennis is an Olympic sport that is played at all levels of society, by all ages, and in many countries around the world.  Except for the adoption of the tie-breaker in the 1970s, its rules have remained remarkably unchanged since the 1890s.  Millions of people also follow tennis as a spectator sport, especially the four Grand Slam tournaments.
==Footnotes==
 
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==Manner of play==
</small>
===The court===
Tennis is played on a rectangular, flat surface that can be composed of various materials.  The court is 78 feet (23.77 meters) long and its width is 27 feet (8.23 m) for singles matches and 36 feet (10.97 m) for doubles matches. Additional clear space around the court is required in order for players to reach balls. A net is stretched across the full width of the court, parallel with the baselines, dividing it into two equal areas. The net is 3 feet 6 inches (1.07 m) high at the posts and 3 feet (914 mm) high in the center.
 
====''The lines''====
The two lines that delineate the width of the court are called the baseline.  The short mark in the center of each baseline is referred to as either the hash mark or the center mark.  The outermost lines that make up the length are both called the doubles sideline.  These are the boundaries used when doubles is being played.  The area between the doubles sideline and the lines next to them is called the doubles alley, which is considered to be "out" in singles play.  These lines next to the doubles sideline are the singles sidelines, and are used as boundaries in singles play.  The line that runs across the center of a player's side of the court is called the service line; despite its name this is not where a player legally stands when making a serve.  The line dividing the service line in two is called the center line or center service line.  The boxes that this center line creates are called the service boxes; depending on a player's position, they will have to hit the ball into one of these when serving.

Latest revision as of 10:19, 11 September 2020

1901 photograph of a stentor (announcer) at the Budapest Telefon Hirmondó.

Telephone newspaper is a general term for the telephone-based news and entertainment services which were introduced beginning in the 1890s, and primarily located in large European cities. These systems were the first example of electronic broadcasting, and offered a wide variety of programming, however, only a relative few were ever established. Although these systems predated the invention of radio, they were supplanted by radio broadcasting stations beginning in the 1920s, primarily because radio signals were able to cover much wider areas with higher quality audio.

History

After the electric telephone was introduced in the mid-1870s, it was mainly used for personal communication. But the idea of distributing entertainment and news appeared soon thereafter, and many early demonstrations included the transmission of musical concerts. In one particularly advanced example, Clément Ader, at the 1881 Paris Electrical Exhibition, prepared a listening room where participants could hear, in stereo, performances from the Paris Grand Opera. Also, in 1888, Edward Bellamy's influential novel Looking Backward: 2000-1887 foresaw the establishment of entertainment transmitted by telephone lines to individual homes.

The scattered demonstrations were eventually followed by the establishment of more organized services, which were generally called Telephone Newspapers, although all of these systems also included entertainment programming. However, the technical capabilities of the time meant that there were limited means for amplifying and transmitting telephone signals over long distances, so listeners had to wear headphones to receive the programs, and service areas were generally limited to a single city. While some of the systems, including the Telefon Hirmondó, built their own one-way transmission lines, others, including the Electrophone, used standard commercial telephone lines, which allowed subscribers to talk to operators in order to select programming. The Telephone Newspapers drew upon a mixture of outside sources for their programs, including local live theaters and church services, whose programs were picked up by special telephone lines, and then retransmitted to the subscribers. Other programs were transmitted directly from the system's own studios. In later years, retransmitted radio programs were added.

During this era telephones were expensive luxury items, so the subscribers tended to be the wealthy elite of society. Financing was normally done by charging fees, including monthly subscriptions for home users, and, in locations such as hotel lobbies, through the use of coin-operated receivers, which provided short periods of listening for a set payment. Some systems also accepted paid advertising.

Footnotes