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In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
The siren appeared in several illustrated manuscripts of the Physiologus and its successors called the bestiaries. The siren was depicted as a half-woman and half-fish mermaid in the 9th century Berne Physiologus, [25] as an early example, but continued to be illustrated with both bird-like parts (wings, clawed feet) and fish-like tail. [26]
Siren (DC Comics), the name of two DC Comics characters Siren (Transformers), a character from The Transformers: Headmasters Siren, a character in Ice Age: Continental Drift
There is an earthquake warning system in Israel, which uses the sirens, which called "תרועה" (Trua). Siren in Israel, during missile attack, October 2024. The "all clear" signal is used three times per year to denote a moment of silence (of one or two minutes): once on Israel's Holocaust Remembrance Day and twice on the Day of Remembrance.
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
Why do the outdoor sirens go off for high winds as well? The potential for serious injury to unsheltered persons from these winds “are comparable to that of an EF0 tornado,” according to a ...
When activated, sirens will sound for 3-5 minutes and repeat every 10-15 minutes while a warning is active. They do not sound continuously or issue an "all clear" alert when a warning expires.
In another myth, Hera, queen of the gods, persuaded the Sirens to enter a singing contest with the Muses, which the Sirens lost; [13] out of their anguish, writes Stephanus of Byzantium, the Sirens turned white and fell into the sea at Aptera ("featherless"), where they formed the islands in the bay that were called Souda (modern Lefkai). [14]