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The net cord "Let" sensor was a simple piezoelectric device, initially a guitar pickup, to detect if the tennis ball touched the net during the service delivery. The service line sensors, net-cord sensor, legal serve and foot fault devices were turned "on" in unison during the process of a player serving the ball at the beginning of each point ...
Cogswell found paddle tennis equipment in a sporting goods store and started using it on their court after lowering the net that they had used to play deck tennis. [4] As the balls they used tended to go out of play, fencing was added, rising from an initial height of 8 feet (2.4 m) up to 12 feet (3.7 m) as of 1932.
The net is placed at a height of 31 inches (0.78 m). On the west coast, a restraint line is drawn 12 feet (3.66 m) back parallel to the net. During play, all players must keep both feet behind the restraint line until after the player receiving the serve has struck the ball.
The net posts are 3 ft (0.914 m) outside the doubles court on each side or, for a singles net, 3 ft (0.914 m) outside the singles court on each side. Based on the standard rules of tennis, the size of the court is measured to the outside of the respective baselines and sidelines. The "service" lines ("T" and the "service" line) are centered.
Lawn tennis: "Regular" tennis, as opposed to real tennis, the game from which tennis is derived. Reflects the fact that the game was first played on grass. [78] Let-check: Electronic sensor on the net that assists chair umpires in calling lets by detecting vibration. Typically, it is used only on show courts in professional matches, like ...
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The International Tennis Federation (ITF) is the governing body of world tennis, wheelchair tennis, and beach tennis. It was founded in 1913 as the International Lawn Tennis Federation by twelve national tennis associations .
Wheelchair tennis is one of the forms of tennis adapted for wheelchair users. The size of the court, net height and rackets are the same, but there are two major differences from pedestrian tennis: athletes use specially designed wheelchairs, and the ball may bounce up to two times, where the second bounce may also occur outside the court. [1] [2]
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