Vehicle horn England, developed a standard electric car horn in 1910. Car horns are usually electric, driven by a flat circular steel diaphragm that has an electromagnet acting on it in one direction and a spring pulling in the opposite direction. The diaphragm is attached to contact points that repeatedly interrupt the current to that electromagnet causing the diaphragm to spring back the other way, which complete the circuit again. This arrangement opens and closes the circuit hundreds of times per second which creates a loud noise like a buzzer or electric bell, which sound enters a horn to be amplified. There
Sound the Alarm (band) Joe Brule joined the band, Sleepwell began writing original material and won local acclaim. Working with Rob Freeman, then of Hidden In Plain View, Sleepwell recorded a demo and word spread quickly about the band. In 2004, they were courted by producer Howard Benson while still students at Bangor Area High School. The band changed its name to Sound The Alarm because of a threatened lawsuit by a mattress company alleging that the name "Sleepwell" infringed on their copyright. The group graduated early from high school in 2005, newly christened as Sound The Alarm, released an EP on Rock Ridge