The art of cinema projection

Murray Thompson  has directed my attention to a neat little film "Projection: 85 Years of the Projection Booth in Movies", available on Vimeo.  It is an edited, 12 minute compilation of scenes in, or involving, projection booth from 40 films, featuring the near extinction art of cinema projection. It has a very long url but a search under the film title, or its creator (Joseph O. Holmes) should find it.