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 (Saves the Day album) trilogy with the theme of self-discovery. It was followed by "Under the Boards" (2007) and "Daybreak" (2011). Conley said that "Sound the Alarm" was "an expression of discontent. "Under the Boards" is reflection and remorse. "Daybreak" is acceptance." All the album's songs were written by the band, with Conley providing lyrics. According to Conley, "Sound the Alarm" details the "furious truth of my aching heart, my tumultuous emotional landscape, and my fractured psyche. Knowing that I needed to turn myself around after nearly destroying myself and my relationships with my strained emotional existence". Describing the album's theme, Conley said it