Blow Your Own Horn (1923)

Jack Dunbar, needing a job, meets millionaire Nicholas Small, who gives him advice and presents him as a colleague. Small would like his daughter, Anne, to marry inventor Gillen Jolyon. Dunbar perfects and successfully demonstrates Jolyon's wireless power transmitting device in spite of Small's attempts to sabotage it, and he rescues Anne when she is caught in an electric power fracas caused by her father's villainy. Anne breaks her engagement with Jolyon and marries Dunbar.