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A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...
A pair of officials at a Maryland high school football game in September 2008. White knickers used to be worn by officials; black trousers are now standard.. For ease of recognition, officials are usually clad in a black-and-white vertically striped shirt and black trousers with a thin white stripe down the side (this was formerly white knickers with black/white striped stirrup stockings or ...
The referee organises a coin toss with the team captains to decide who taps off and what end each team takes initially. Whistle Referees must carry a whistle to stop play and then signal to players about many things during a game. A referee will let players know when to stop after foul play or while awarding a touchdown and at other times in a ...
A referee sends a player to the "sin bin" for ten minutes. Spread fingers are used as the signal instead of a yellow card. Yellow card A yellow card is used to signal that a player is being temporarily suspended from the game. The player is sent to the "sin bin" for 10 minutes, after which time they are allowed to return to carry on playing. [4]
Metal whistle similar to that used by most referees. Rugby union match officials must use the following equipment: Coin The referee organises a coin toss with the team captains to decide who kicks off and what end each team takes initially. [5] Whistle Referees must carry a whistle to indicate certain occurrences in the game. [6] Red card
FILE - Referee Stephanie Frappart gives directions during the French Cup final soccer match between Nice and Nantes at the Stade de France stadium, in Saint Denis, north of Paris, Saturday, May 7 ...