By eHow Sports & Fitness Editor
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A megaphone, or speaking-trumpet, is designed to amplify and direct a speaker's voice in a particular direction. It is a cone-shaped hand-held device commonly used at sporting events, with larger models used by cheerleaders and smaller models used in the stands by fans. Thomas Edison exhibited a megaphone at the Paris Exposition, while crooner Rudy Vallee was often depicted singing into one. Read on to learn more.
eHow Sports & Fitness Editor