Inertia in the Service of Cinematography
W. C. Plank · Journal of the Society of Motion Picture Engineers · 1932
This paper is concerned principally with the opposite rôles played by mechanical inertia in the two types of projector, the continuous and the intermittent, special emphasis being placed upon the continuous type. By employing the inertia of the moving parts of the continuous projector, the attainment of accurate registration of successive images is greatly facilitated, whereas, in the intermittent type of projector, the inertia of the moving parts, becoming manifest between successive projections, adds materially to the difficulty of obtaining accuracy of registration, not to speak of the strains induced upon the moving film and parts of the projector.