In [Bill]’s latest video, he tears down a 1979 Bell & Howell 16mm projector to probe its inner workings. Movies operate on the persistence of vision (POV) principle, which basically states ...

The camera in question is a magazine-fed Bell & Howell Model 172 from the 1950s. In its original spring-driven form, it could shoot for approximately 35 seconds at a (jerky) frame rate 16 fps.