Vaudeville Ventriloquism

Ventriloquism is when a performer masks his mouth movement as he speaks, while simultaneously making it seem like a puppet is the one doing the talking. The puppet is a hand puppet, and it interacts with the performer so that the two seem like they're in conversation. It is a common use of puppetry, and typically performed for comedic effect. This book outlines the act of ventriloquism, including exercises for how to become a ventriloquist.