books.google.ca - "Famous while still young for inventing the telephone, which eventually secured his fortune as well as the admiration of the world, he ended his career in the chase to develop the airplane and as the inventor of a hydrofoil. When President Garfield was shot, Bell created a sonar probe to locate the assassin's...http://books.google.ca/books/about/Reluctant_Genius.html?id=ujlCgf1uSJIC&q=Visible+Speech&utm_source=gb-gplus-shareReluctant Genius
