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206 SOUND MOTION PICTURES
that the sensitive light valves change the faint fluctuations of electrical current set up in the microphones to tiny lines of varying intensities on the film. Later, when duplicates of this film pass through projectors in theatres, the tiny lines change light rays back into sound, which is then amplified through loudspeakers behind or around the screen.
Simultaneously with this light ray recording on the film, an impression is made on a wax disk similar to the usual phonograph records on apparatus in another recording room. This disk is known as the "play-back" record and is used as a check on the scene. Immediately after the taking of a scene the director may step into a room adjoining the stage and through loudspeakers hear what has just been recorded. In this way he may judge the quality of the scene and determine whether retakes are necessary. This room is a completely equipped sound projection chamber of adequate size and correct acoustical characteristics; and it is here that the film is judged for tone as well as for visual quality.
The amplifying room is virtually the only unit of the recording apparatus that operates automatically. It contains a multitude of vacuum tubes and electrical instruments that amplify the sound, as it is taken, to an intensity that permits recording in shadings of light and darkness on the film. When a scene is being recorded, this unit, having once been set by the engineer in charge, is henceforth automatic in its operation, although from time to time the operator at the "mixing" panel changes the degree of amplification to suit specific requirements.
The cutting rooms, where the sound film is edited, are adjacent to a screening room, because the cutters now edit their film by sound as well as sight. Scenes must be run through the projectors so that they may be timed properly.