The Research Council Developments for Better Theater Projection
Walter Beyer · Journal of the SMPTE · 1960
An extensive theater liaison program undertaken by the now disbanded Motion Picture Research Council stimulated several very important advancements in theater projection during the past few years: (1) a plastic drive-in screen with a gain of more than 2.5; (2) an inexpensive light meter capable of reading both incident and reflected light; (3) a liquid heat filter to reduce heat on film and lens focus drift; (4) 35mm and 70mm projector alignment films; and (5) a film-path gage and an optical alignment tool.