BS 5550-3.10.2 – Cinematography. 35 mm film. Sprockets
16-tooth intermittent, 16-tooth, 24-tooth, 32-tooth feed, sound-head, holdback sprockets. Dimensions, including dimensions for form of teeth. For Type C. 1870 film, film having perforations 0.078 m x 0.078 m or 0.110 m x 0.078 m.