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A party whistle.
A metal pea whistle.

A whistle or call is a simple aerophone, an instrument which produces sound from a stream of forced 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.


The whistle has its roots dating back to ancient China, where night watchmen would blow into the tops of acorns to alert the towns to invading Mongolians. In ancient Egypt two blades of the papyrus plant along the Nile river were held together in between the palms. By blowing into the palms the papyrus leaves would make a loud vibrant sound.


Many types exist, from small police and sports whistles (also called pea whistles), to much larger train whistles, which are steam whistles specifically designed for use on locomotives and ships. Although whistles have a musical characteristic (for example train whistles sound a minor-seventh musical chord) whistles are not usually considered "musical" in the sense of being able to play a chosen melody, but the small whistles can also be used as a – very shrill and loud – noise and rhythm instrument. However, musical whistles exist, including any of several 2-octave musical instruments known as tin whistles (sometimes known as pennywhistles or low whistles), as well as the calliope (an array of separately actuable steam whistles), organ pipes and the recorder. Pea whistles are used in jazz and Latin music as a percussion instrument, and children often use them as a toy music instrument.

The whistle works by causing the smooth flow of air to be split by a narrow blade, sometimes called a fipple, creating a turbulent vortex which causes the air to vibrate. By attaching a resonant chamber to the basic whistle, it may be tuned to a particular note and made louder. The length of the chamber typically defines the resonance frequency. A whistle may also contain a small light ball, usually called the pea, which rattles around inside, creating a chaotic vibrato effect that intensifies the sound. Japanese bird whistles use several small balls and are half filled with water in order to reproduce the sound of a bird song.

A steam whistle works the same way, but using steam as a source of pressure: such whistles can produce extremely high sound intensities.

Sometimes, unintentional whistles can be set up. A common one is the opened sunroof of a car: air passing over the top of the vehicle can, at certain speeds, strike the back edge of the sunroof, creating a very low frequency whistle which is resonated by the closed interior of the car. Since the sound frequency is infrasonic, around 4 Hz, the effect is very uncomfortable for occupants, who feel the vibration rather than hear it. Such low frequencies can induce nausea, headache, disorientation and dizziness. The effect can be prevented by opening a side window a few inches. Subsonic whistles have also been developed for use as weapons, or to deliberately create a sense of uneasiness in an enemy.

Fields and usages

Police whistles

Examples of police whistles

In Englandmarker since the Metropolitan Police Services inception in 1829, officers have been issued with the "Metropolitan" whistle. Prior to this, police used hand rattles, with whistles only being used as musical instruments or toys. Both rattles and whistles were used to call for back-up in areas where neighbourhood beats overlapped, and following their success in Londonmarker, the whistle was adopted by most counties in England.

J Stevens & Son & J Dixon & sons made police whistles from around the 1840s, T Yates made Beaufort whistles for the Liverpool Police in the 1870s. The 1880s and 1890s saw police whistles made by W Dowler & Sons, J Hudson & Co, J Barrall, R A Walton, H A Ward and A De Courcy & Co.

Police whistles fell into disuse in many countries in 1969, when early hand-held radios were brought into service. With the rise of the motor car, the whistle was no longer usefully audible in urban areas. The whistle is still used by some police forces today, and engraved ceremonial versions are sometimes presented to police officers upon occasions such as their retirement.

Industrial whistles

Industrial whistles are used for signal and timekeeping both on railroad and ships, and in factories. Most of these whistles were steam powered and not standardized. Individual locomotives could be identified by their whistles. At noontime in industrial areas up into the 1950s whistles of every pitch could be heard, as each factory had a boiler and a whistle, if not full steam power.


Whistles are often used as warning devices or as safety devices serving to attract attention to the user. Some cyclists use a whistle as a substitute for a bell or horn. It should be noted, however, that many jurisdictions require that the warning device be permanently attached to the bicycle.

Rescue or survival whistles are often packed in survival kits and attached to personal flotation devices to allow a victim to signal for help. The whistle is audible at much greater distances than the human voice, and is less likely to cause exhaustion if used repeatedly. Survival whistles differ from pea whistles in that they are usually flat, so that water cannot collect inside if the user is immersed, for example after falling overboard from a boat.

Whistles can also produce sounds at pitches inaudible to the human ear such as dog whistles which can be heard by dogs at a range beyond that of human sensory perception, or at least conscious perception.


Ship's whistles must be very loud for safety on the seas. Modern ship's whistles can be electrically or steam driven. was originally equipped with three electric Tyfon whistles in 1932. They could be heard at least ten miles away and were tuned to 55 Hz, a low bass A note that was chosen for maximum passenger comfort despite the high sound pressure level. One of the three whistles was taken back to Kockum Sonics in Malmömarker, Swedenmarker, where it was refurbished for a new life of service aboard the RMS Queen Mary 2. Modern IMO regulations specify ships' whistle frequencies to be in the range 70-200 Hz for vessels that are over 200 meters in length. Traditionally, the lower the frequency, the larger the ship. The Queen Mary 2, being 345 meters long, was given the lowest possible frequency (70 Hz) for her regulation whistles which means she carries both 70 Hz modern whistles and a single vintage 55 Hz whistle.


Railroads in particular used elaborate whistle codes for communication both within the train and with other trains. These methods are maintained today with motor-powered air horn. Trucks also use air horns, especially since they often have air brakes and so there is already a source of compressed air on board.

Train whistles generally produce three or four different frequencies at the same time to produce a non-major chord that is distinct, loud, and low in pitch.


Whistles are used by referees to officiate sporting matches. The whistle was first used to stop a sports match by William Atack in an 1884 game of rugby in New Zealandmarker. Before that game referees used their voices to control play.

Some sports use different types of whistles, but one used around the world in many sports is the Fox 40, a pealess whistle which creates sound using air pressure only. The Fox 40 is used in basketball, hockey, ice hockey, soccer and numerous other games, as it can be heard easily over the noise of the audience.

Another whistle widely used for sports such as Touch Football, Rugby League and Rugby Union is the Thunderer 58.5 by Acme Whistles. It is a metal whistle containing a cork pea. It is used mainly because of its design that allows the user to create a deep, low-pitch shrill that can be heard from hundreds of meters away.


A samba whistle with three tones
The whistle is used by a leader in samba percussion groups help to catch the percussionist's attention. The traditional samba whistle has three tones, but as the size of the percussion section rose, pealess whistles became more popular due to their high pitch and their loud sound.

The slide Whistle (or swanee whistle) was a common instrument in some types of music and was popular as a musical effect in the early days of radio and television.

Pitch pipes are reed whistles used to help in tuning musical instruments and have been common since the 1850s.


Whistles were used in various military engagements in the 20th century. They were used primarily to initiate a pre-set plan so that all parts (within earshot) would move simultaneously. For example, officers in the first world war would sometimes blow whistles to signal all troops along a broad stretch of trench to attack at the same time.


Other whistles include bird calls, game calls, shepherd's whistles, Swiss warblers, Chinese pigeon whistles, Chinese and Japanese kite whistles, cuckoo clocks whistles, communication tube whistles, whistling kettles, whistling tops and various toy whistles.

Patents and inventors

In 1868 Joseph Hudson of Birminghammarker, England, made the first whistle ever to be used by a football referee. New Zealandmarker referee William Atack was the world's first to use a whistle to stop a game of sport in 1884. It was used for the first time (allegedly) at a game held at Nottingham Forest, prior to this referees used handkerchiefs to attract players' attention.

By 1884, Joseph Hudson had perfected his whistles and he released the world's most successful whistle to date, the "Acme Thunderer" (the first ever pea whistle). The whistle has been used as an alarm or attention-getting instrument by all manner of industries, sports and revellers. It continues to sell in great quantities throughout the world.


  1. Taylor, J. "The Victorian Police Rattle Mystery" The Constabulary (2003)
  2. The Voice of the Queen Mary
  3. Kockum Sonics: Tyfon product IMO regulations

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