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82 SOUND MOTION PICTURES
difficulties which may require attention and give them to the service inspector when he arrives at the theatre.
In certain sound equipment, storage batteries supply the magnetizing current. These have been eliminated in the more advanced models, but for the benefit of the managements that are still operating under storage batteries the following information is offered. (The batteries referred to are in connection with the Western Electric System.)
One set of storage batteries, called the H batteries, is used to supply magnetizing current to the receivers attached to the horns, and two other sets, Fi and F2, supply filament current for the amplifiers, exciting lamps, etc. The Fi and F2 sets are used alternately, one set being on charge while the other is running. It is very important always to follow this practice. It is necessary in order to maintain the charge and insure adequate filament power for every show.
The A and H storage batteries are to be operated in two sets. A-i and H-i constitute one set; A-2 and H-2, the other. Whenever one set is running the other should be on charge. By always charging one set (at the rate adjusted by the engineer) while using the other the charge will be maintained. Ordinarily, when running short numbers, use the A-i, H-i batteries for all performances one day, and meanwhile keep the A-2, H-2 batteries on charge. The next day, use the A-2, H-2 and charge the A-i, H-i. Keep alternating the batteries in this manner each day. If you are using your batteries for a total of seven hours or more a day, as in the case of synchronized scores for feature pictures, use the A-i, H-i set for the afternoon show, and the A-2, H-2 for the night show. Change over from one set to the other after half of the day's show has been run, and of course keep on charge the ones not being used. If, under the above regulating programme, the batteries