Acme siren
Encyclopedia
The Acme Siren is a percussion instrument
Percussion instrument
A percussion instrument is any object which produces a sound when hit with an implement or when it is shaken, rubbed, scraped, or otherwise acted upon in a way that sets the object into vibration...

 used in concert band
Concert band
A concert band, also called wind band, symphonic band, symphonic winds, wind orchestra, wind symphony, wind ensemble, or symphonic wind ensemble, is a performing ensemble consisting of several members of the woodwind instrument family, brass instrument family, and percussion instrument family.A...

s for comic effect. Often used in cartoons, it produces the stylized sound of a police siren
Siren
In Greek mythology, the Sirens were three dangerous mermaid like creatures, portrayed as seductresses who lured nearby sailors with their enchanting music and voices to shipwreck on the rocky coast of their island. Roman poets placed them on an island called Sirenum scopuli...

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The instrument is typically made of metal and is cylindrical. Inside the cylinder is a type of fan-blade which, when the performer blows through one end, spins and creates the sound. The faster the performer blows, the faster the fan-blade moves and the higher the pitch
Pitch (music)
Pitch is an auditory perceptual property that allows the ordering of sounds on a frequency-related scale.Pitches are compared as "higher" and "lower" in the sense associated with musical melodies,...

 the instrument creates. Conversely, the slower the performer blows, the lower the pitch
Pitch (music)
Pitch is an auditory perceptual property that allows the ordering of sounds on a frequency-related scale.Pitches are compared as "higher" and "lower" in the sense associated with musical melodies,...

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Acme is the trade name of J. Hudson & Co. of Birmingham
Birmingham
Birmingham is a city and metropolitan borough in the West Midlands of England. It is the most populous British city outside the capital London, with a population of 1,036,900 , and lies at the heart of the West Midlands conurbation, the second most populous urban area in the United Kingdom with a...

who developed and patented the Acme Siren in 1895. It was sometimes known as "the cyclist's road clearer".
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