Megaphone Public_address_system
a late 19th-century speaking trumpet used firefighters. a small sports megaphone cheering @ sporting events, next 3 in. cigarette lighter scale from ancient greek era nineteenth century, before invention of electric loudspeakers , amplifiers, megaphone cones used people speaking large audience, make voice project more large space or group. megaphones typically portable, hand-held, cone-shaped acoustic horns used amplify person’s voice or other sounds , direct towards given direction. sound introduced narrow end of megaphone, holding face , speaking it. sound projects out wide end of cone. user can direct sound pointing wide end of cone in specific direction. in 2010s, cheerleading 1 of few fields nineteenth century-style cone still used project voice. device called “speaking-trumpet”, “bullhorn” or “loud hailer”.