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So what do we think? The first sentence says Hardeen was "the inventor of the famous handcuff act", so we're already in the realm of hyperbole. And the claim that Hardeen "invented" what sounds like slow motion photography is pretty far fetched (and this was before the Film Developing Corp). But what of the main claim that Hardeen planned to film his escapes for the police?
This was during Hardeen's 1915 tour in which he played opposite Houdini in San Francisco, Oakland, Los Angeles and Salt Lake City. Hardeen's act was very much a mirror of his brother's act, so it's entirely possible that he also showed films of his exploits as a warm up. Houdini at this time was filming his suspended straitjacket escapes. So the idea of Hardeen also building up a collection of film footage, maybe sharing the same camera equipment, is feasible. Although I don't think I buy the idea of his films being shot as as a study aid for police.
Apart from the well-known Metamorphosis footage and film of an overboard box escape in Atlantic City in the 1930s, I don't know of any surviving film of Hardeen doing escapes. So wouldn't it be a treat to see this footage and witness Hardeen in action in his prime.
On a related note, you'll see Hardeen was appearing at the Los Angeles Pantages this week. Our friend Jack Cory at Houdini & Hardeen recently did a post about Hardeen's 1917 Los Angeles engagement and points out that the Pantages building still stands at 533 S. Broadway (just down the street from Houdini's Orpheum and next door to Clune's where The Master Mystery played in 1919). It's no longer a theater, but you can still see the Pantages name on the facade.