This is footage of a 1922 movie called “The Man From Beyond”. It features a stunt, by the famous magician Harry Houdini, and his co-star dangerously close to the edge of Niagara Falls. There’s no camera tricks and apparently very few safety fail-safes.
Movie Plot: The body of a man, Howard Hillary (played by Harry Houdini), frozen for a hundred years, is found in the Arctic ice. Thawed out and awakened, Hillary insists that a young woman, Felice, is his fiance from a century before. Hillary is interned in a mental institution but escapes and realizes the truth of where he is and that Felice is actually the descendant of his own Felice from long ago. Hillary joins her in searching for her father, who has been abducted by someone known to them both. (Source IMDB)