Ross Expandascope projection lense, no 5716. Probably previously used at the Central Cinema in Ironbridge, Shropshire.
With the popularity of professional widescreen cinema in the 1950s, there was a similar interest amongst amateur filmmakers and exhibitors which led to the development of specific pieces of equipment to allow the expansion of the small gauge film image. In the UK, it was Ross who produced the Expandascope lens for the showing of Cinemascope prints. This was available for use on 16mm projectors, so that soon widescreen could be exhibited in smaller halls through the use of anamorphic technology.