Where did 35mm film come from?
When Bell & Howell started there were many sizes of movie film. This created problems for theatres having to replace parts on their projectors for each film they would show. Sometimes they wouldn’t be able to show a film because size and hole perforations were different than they had encountered before. Quality and playback of films varied greatly. Projectionists had to guess at the frame rates and adjust for each film.
From day one of the company, Albert Howell choose 35mm film width as a quality and practical standard. They engineered all the cameras and projectors to work together with film meeting specifications. The results were dramatic experience in the theatres. Over a decade Bell & Howell equipment became the market leader and other manufacturers followed their standard.