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The Acme Thunderer. The name "Acme" was taken from the Greek word acme, meaning a high point, indicating that the whistle was a tool for producing a very high decibel level. Their Tornado 2000 whistle is capable of easily reaching 122 decibels. J Hudson & Co was founded in the 1870s in Birmingham by Joseph Hudson (1848–1930) and his brother ...
The Aztec death whistle or ehecachichtli is a type of whistle formerly used by the Mexica people. Though the original whistles likely made a soft wind sound, modern replicas usually produce a high-pitched shrieking sound and are most commonly used to scare off people or animals.
This whistle is the reason for the typical "long high - short low - short high" signal sound of steam locomotives in Germany. [18] Chime whistle – two or more resonant bells or chambers that sound simultaneously. In America, railway steam whistles were typically compact chime whistles with more than one whistle contained within, creating a chord.
While the previous whistles occur at low flow speeds, this whistle occurs at very high speeds. When a subsonic jet impinges on a cavity, jet instability becomes part of the feedback loop as with the hole tone. When a supersonic jet impinges on a cavity, acoustic shock wave instability becomes part of the feedback loop. The figure on the right ...
In the United Kingdom, the manufacturers claim that the tones are broadcast at 75 dB, [citation needed] meaning that the product falls within the government's auditory-safety limits, although the German news source Heise reported the device emits 85 dB, [37] and websites [citation needed] selling the Mosquito claim it can go up to 95 dB with a ...
Measured with a 60 dB SPL signal, the hearing range for the Senegal bushbaby is 92 Hz–65 kHz, and 67 Hz–58 kHz for the ring-tailed lemur. Of 19 primates tested, the Japanese macaque had the widest range, 28 Hz–34.5 kHz, compared with 31 Hz–17.6 kHz for humans.