Portable mobile phones that we would recognise today did not appear until the 1980s and even then they were still too big to hide in the palm of your hand.
In a video that Mr Clark has posted on YouTube he jokes that the only plausible theory is that the woman is a time traveller.
He says: ‘This short film is about a piece of footage I found behind the scenes in Charlie Chaplins film The Circus.'
'Attending the premiere at Manns Chinese Theatre in Hollywood, California - the scene shows a large woman dressed in black with a hat hiding most of her face, with what can only be described as a mobile phone device - talking as she walks alone.
‘I have studied this film for over a year now - showing it to over 100 people and at a film festival, yet no one can give any explanation as to what she is doing.
‘My only theory - as well as many others - is simple... a time traveller on a mobile phone. See for yourself and feel free to leave a comment on your own explanation or thoughts about it.'
Chaplin’s The Circus was one of the master director’s final silent movies and won him the Academy Award in 1929 for ‘Versatility and genius in writing, acting, directing and producing’.
It tells the story of the Tramp, who works as a clown in a circus and who falls in love with a circus-master’s daughter.
Chaplin produced the film at the height of the legal fallout over his divorce from Lita Grey and he did not mention it once in his autobiography, even though it is now regarded as one of his masterpieces.
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