British patent number 24589 of 1912 was granted to James Williamson and Colin Martin Williamson for 'Improvements in the Construction of Cinematograph Cameras'. The patent was applied for on 30 October 1912 and accepted on 10 April 1913. The Williamson company made cinematographic movements for Houghtons and Houghton-Butcher, who sold them under the Ensign trade name. It is likely that the camera casing was made by Houghtons.