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MANAGERS AND PROJECTIONISTS 1005
projection room, including walls and ceilings, be gone over thoroughly. In the end it will be a paying proposition, because of the fact that dust in the air joins with the oil and forms a mild grinding paste which wears projector bearings much faster than they would wear were the dust not present. That is not a mere well sounding statement. It is cold fact.
A vacuum cleaner also, if provided, may be used for removing accumulations of carbon ash, etc., from the lamphouses, and for sucking or blowing the dust from around the armatures of motors and generators.
INTERCHANGEABILITY OF FILMS AND APPARATUS.—The film sound track has been what amounts to standardized at one-tenth (1/10) of an inch wide. That is to say, so far as is known, all producers of sound film are using that width, and any sound track of that width may be projected upon any make of apparatus built for that sound track width.
For example : Movietone, RCA Photophone, DeForest Phonofilm, Powers Cinephone films, may all be projected with the apparatus of either of the said companies, all of which are at this time being built to accommodate disc record reproduction as well.
CLEANING SOUND FILM.— In cleaning film great care must be exercised not to exert sufficient pressure to scratch the sound track in any degree. Of course the method to be pursued varies with the amount and character of the dirt. You are referred to page 290, Volume 1, concerning the general proposition of film cleaning.
With regard to sound film, particularly the kind which carries the sound in almost microscopically minute lines extending across the sound track (variable density),