The Master Key

"The Master Key" by L. Frank Baum is a children's fantasy novel written during the late 19th century. The story revolves around a young boy named Rob, who becomes fascinated with electricity and creates an array of electrical devices in his workshop. Through a series of adventures, Rob accidentally comes into contact with the "Master Key of Electricity," summoning the Demon of Electricity, who grants him several remarkable gifts that showcase the wonders of electrical power.