Tornado siren2.docjh

Tornado Sirens

By jhicks
  • Invention of the siren

    Invention of the siren

    History of Siren The first siren was invented sometime before 1799 by John Robison.
  • Period: to

    The Time period of the Siren

  • The Siren is Improved

    The Siren is Improved

    The Improved Siren Sometime around 1819, the new and improved siren was made by Charles Cagniard de la Tour.
  • Danger Warning

    Danger Warning

    The siren was used in World War II to warn people that danger was approaching.
  • Production of the Mechanical Siren

    Production of the Mechanical Siren

    The tornado siren was improved to become a mechanical siren during the Cold War. It was produced from the early 1950's to the late 1980's.