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
John A. Horn 1996 from the University of Virginia School of Law. John A. Horn John A. Horn is an American attorney. Currently with the law firm King & Spalding, he is a former United States Attorney for the Northern District of Georgia. During his 15-year tenure with the U.S. Attorney's Office in Atlanta, Horn served as deputy chief of the Narcotics & Organized Crime Drug Enforcement Task Force, then Appellate Division chief and first assistant U.S. attorney under Sally Yates. Horn became acting U.S. attorney after then-President Barack Obama nominated Yates as Deputy Attorney General. When Horn's term expired in December 2015,