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  2. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    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 ...

  3. Fox 40 - Wikipedia

    en.wikipedia.org/wiki/Fox_40

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  4. Official (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Official_(gridiron_football)

    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 ...

  5. J Hudson & Co - Wikipedia

    en.wikipedia.org/wiki/J_Hudson_&_Co

    The 1950s and 60s marked growing demand for Hudson sports whistles (Olympics and other sport events on five continents). In 1957 A. R. Topman became an assistant general manager, and about 40 years later his son, Simon Topman, became the owner and the managing director of the company, starting the fourth period of company developments.

  6. Whistle - Wikipedia

    en.wikipedia.org/wiki/Whistle

    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.

  7. Rugby union match officials - Wikipedia

    en.wikipedia.org/wiki/Rugby_union_match_officials

    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