Down the page a bit you'll find Russ Alsobrook's 5-part "Machines that Made the Movies" series. Good stuff!
Though his description of a Cinerama camera in Part 3 sounds like the later Cinemiracle camera.
The original photography was accomplished by a set of three Mitchell cameras rolling six-perf 35mm film at 26 frames- per-second through a trio of matched 27mm lenses.
The Cinerama camera used three Wall movements, modifyed to 6-perf, in a single body.
the Cinemiracle had three NC cameras shooting into mirrors in order to eliminate parallex between the cameras.