The cameras at the time could only hold a thousand feet of 35mm film — or about 10 minutes of recording.
当时的相机只能容纳1000英尺的35毫米胶片,也就是大约10分钟的记录。
英语百科
9.5 mm film
(重定向自9.5mm film)
9.5mm film is an amateur film format introduced by Pathé Frères in 1922 as part of the Pathé Baby amateur film system. It was conceived initially as an inexpensive format to provide copies of commercially made films to home users, although a simple camera was released shortly afterwards.