Long-roll camera is the name given to specialized cameras designed to use (typically) 100-foot film magazines, allowing hundreds or even thousands of exposures to be made without reloading.
The applications for such cameras may include utilitarian purposes such as scientific data collection, document recording, or traffic cameras. But their widest use may be in high-volume portrait photography, such as "school picture day" cameras, or photographing ID badges, police mug-shots, etc. Such cameras typically use AC electric motors for rapid film advance.
These cameras were specialized professional tools that did not sell in great volumes, and so information about them is somewhat hard to come by.
Many long-roll cameras use one of three film sizes: 70mm, 46mm, or 35mm, formerly manufactured by Kodak, Agfa, Konica and perhaps others in portrait-friendly color negative emulsions. The film may be perforated or not. As of this writing (2011) all but non-perf 35mm have been phased out, as professional users of these cameras migrate to digital.
Remnant long rolls of 46mm film have attracted some interest from users of 127 film cameras, as the bulk roll may be cut into lengths of 25" (640 mm) in a darkroom and respooled onto used 127 spools and backing paper.