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OPERATING MANUAL 115
circuits to limit the charging current to the proper value. On alternating current supply, which of course cannot be directly used for charging, rectifiers are used to supply charging current at the required voltage.
Matters relating to the charging and general care of batteries are covered in the next chapter.
In systems employing the one F-D type battery charging panel, one set of storage batteries, called H batteries, are used to supply magnetizing current to the receivers attached to the horns. The two other sets, F-i and F-2, supply filament current for the amplifier exciting lamps and indicating lights. The F-i and F-2 sets are used alternately, one set being on charge while the other is supplying current. It is very important always to follow this practice, which is necessary to maintain the charge, so that adequate power may be available for every show.
In systems using the 40-type battery charging panel, there are two sets of batteries, number 1 and number 2, supplying current for the horns, amplifiers, filaments, exciting lamps, and indicating lights. They are used alternately, one being on charge while the other is supplying current. The length of time each set of batteries should be used before putting them on charge will depend upon the extent to which the equipment is used. In the case of the i-FD battery panel, the charging period may be different for F sets, as compared with H sets. This makes it impossible to lay down any general rule as to how long each set should run. It is therefore essential to use the hydrometer supplied with the batteries to find out when each set needs charging. The charger, which is supplied with the sound equipment, is set for a given charging rate by the engineer who accompanies the sound equipment to the theatre. The charging switch on the A. C. charger may be kept on at all times, for the charger circuit is opened and closed by the switch on the battery panel. A storage