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Joseph Hudson (1848–1930) was an inventor in Birmingham, England during the late 19th century and the founder of J Hudson & Co in 1870, later to become the world largest whistle manufacturer . Hudson entered a competition held by the Metropolitan police force in London in 1883 to design a better way of attracting people's attention.
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 ...
A party whistle A metal pea whistle. A whistle is a musical instrument which produces sound from a stream of gas, most commonly air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.
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The Premier League has its first female referee. Rebecca Welch blew her whistle to start the match between Fulham and Burnley on Saturday in a landmark moment for England's top league. Welch has ...
An assistant referee's judgement is enforced only if the referee accepts that judgement, and the referee has the authority to unilaterally overrule an assistant referee. The referee is the only official empowered with starting and stopping play, and meting out disciplinary actions such as cautions or send-offs.
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]