FLYING WHISTLE BALL 8962, Multi Colour
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History of the Whistle". Granville District Football Referees Association . Retrieved 30 June 2022. Following an injury, should the whistle be used indicate play restarting, if the restart is a dropped ball?
a b c Hernandez, Daisy (30 April 2020). "Why We've Blown the Police Whistle for 150 Years". Popular Mechanics . Retrieved 30 June 2022.a) The referee is the sole judge of fact and of law during a match. The referee must apply fairly all the Laws of the Game in every match. A whistle is an 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. Joseph Hudson set up J Hudson & Co in Birmingham in 1870. With his younger brother James, he designed the "Acme City" brass whistle. This became the first referee whistle used at association football matches during the 1878–79 Football Association Cup match between Nottingham Forest and Sheffield. Prior to the introduction of the whistle, handkerchiefs were used by the umpires to signal to the players.  A police whistle being blown
Whistles can take a number of shapes and forms. They can be made from different materials, such as metal, wood or plastic. Even the pipes in a pipe organ are essentially whistles. Despite these differences, basically all whistles work alike. What happens when air is blown into a whistle is a complicated mathematical equation. But here are the basics. Air enters the whistle at one end. As the air reaches the other, closed end, all the air molecules "pile up" on top of each other and cause a high-pressure region. The air escapes out the little hole in the end, making the noise you hear. The frequency of the sound is dependent on the length of the whistle. The longer the whistle, the lower the pitch will be. The ball inside the whistle is not necessary for the whistle to work but serves a purpose. A whistle without a ball has a flat tone that may get "lost". The referee may alter a decision when a touch judge has raised the flag to signal touch or an act of foul play.Archaeologists have found a terracotta whistle at the ruins of the ancient Greek city of Assos, most probably a child's toy placed in a child's grave as a burial gift. 
For me, irrespective of whatever the restart is, if you've used your whistle to stop play then you blow again to restart. Williamson, Lori (24 September 2017). "US Army Trench Whistle". Minnesota Historical Society . Retrieved 30 June 2022. One characteristic of a whistle is that it creates a pure, or nearly pure, tone. The conversion of flow energy to sound comes from an interaction between a solid material and a fluid stream. The forces in some whistles are sufficient to set the solid material in motion. Classic examples are Aeolian tones that result in galloping power lines, or the Tacoma Narrows Bridge (the so-called "Galloping Gertie" of popular media). Other examples are circular disks set into vibration.  History [ edit ] Early whistles [ edit ] Carved whalebone whistle dated 1821. 8cm long. Quillacinga clay whistle, c. 1250–1500 AD, at the Museum of Texas Tech University.Cross, David (17 February 2011). "On the Beat in Birmingham - Rules and regulations". BBC . Retrieved 11 March 2014. Police whistles came much later; the early Victorian constable would have carried a small wooden rattle. a) The referee must carry a whistle and blow the whistle to indicate the beginning and end of each half of the match. The referee judges what would have happened next and awards a try or a touchdown at the place where the ball was touched.