This tablet was placed here on June 21 1939 by the proprietors of the Orpheus cinema Bristol as a tribute to the genius of their fellow citizen William Friese-Greene, the inventor of kinematography, and to mark the fiftieth anniversary of his patent guaranteed by the British Patent Office June 21 1889

more info at http://carolineld.blogspot.co.uk/2013/01/william-friese-greene.html