Oh, to signal that they need to go somewhere fast.
there are electromechanical sirens or there are sirens that have a combination of one or more loudspeakers (usually used for broadcasting voice messages). they also are either rotational sirens (horn rotates 360), or omni-directional sirens (points in all directions). See the related links below for examples.
sirens
Mythlogical Sirens were considered the daughters of the river god Achelous, fathered upon Terpsichore, Melpomene, Sterope, or Chthon. Sirens (noisemaker) were originally used as musical instruments, powering the pipes of organs.
They were used to warn of incoming bombing raids. The sirens could be heard over a wide area - and were more effective than (for example) making a radio broadcast.
No, they used only their voices to lure sailors to death.
Yes, they are but are called bomb sirens
For nothing. Sirens are a thing of a later age and were then mostly used to indicate start or end of work on factory sites. In 1793, people were roused to whatever action by blowing a horn.
Sirens are either Greek mythological monsters that lull unsuspecting victims by singing to them OR loud, screeching machines that are used to indicate the danger of a certain area.
Are there sirens for hurricanes?
the sirens
Sirens cause shipwrecks to protect their existence.
No, there is NO roman connection with the Sirens.