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68 SOUND MOTION PICTURES
The installation proceeds in accordance with a carefully laid out plan. First the driving equipment for the motion picture projector is installed. Although the projection mechanism itself remains practically intact its driving motor is replaced by one with an electrically regulated speed control. A film speed of 90 feet per minute is necessary for sound-picture work, but variable speeds may be obtained, if desired, for silent film. Since the motors require four or five seconds to pick up speed it is essential that the projectionist become accustomed to this feature and others like it, so that he may be able to give full attention to the handling of film or disk records when the time for operation arrives.
The battery equipment is installed next, together with the related switching panel and charging apparatus. This permits an investigation of the condition of the batteries and gives ample time for charging them, if necessary. It also gives projectionists an opportunity to study this portion of the apparatus at their leisure and to have explained to them proper schedules of charging. Should a motor generator be required it is set up at this time.
The amplifiers and allied equipment are placed upon the relay racks, and the fader and its auxiliary boxes are mounted at the front of the projection room wall. The position of the monitor horn is carefully selected so that the operating personnel will at all times be able to hear clearly, for it is by following the programme through this horn that fader change-overs are made.
The conduit installation keeps pace while the apparatus is being placed in position. The storage batteries and the alternating current supply are now connected with the amplifying equipment, all of which is carefully checked and tested. The fader can be used with either the film or the disk reproducers associated with the production machines. A film disk transfer switch is included in the reproducing