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MANAGERS AND PROJECTIONISTS 1083
Storage Batteries and Their Care
NOTE. — I desire to express appreciation to the Electric Storage Battery Company, makers of Exide Batteries, and particularly to Mr. John McGuinness of that company, for aid in preparing the matter appearing under the above title. It has the official approval of the Electric Storage Battery Company and of Mr. McGuinness himself.
THE storage batteries you use in sound reproduction are nothing more or less than an auxiliary or secondary power source. They are an arrangement by means of which, through the chemical reaction between certain substances, it is possible to "store'' electrical power, and, within certain well defined limits, retain it in storage for future use. By the use of such a storage arrangement we are enabled to have a thoroughly dependable, quiet and steady source of electric power which, once charged, is entirely independent of the power lines until such time as its energy is exhausted to the point where further storage (charge) is necessary.
It is of course necessary that power be taken from some generating source and stored in the battery, before power can be taken from it. A storage battery generates no power in itself. Putting power into a battery is termed "charging." Only direct current may be used to charge batteries. It therefore is necessary, if the power supply be A. C, to have some sort of device by means of which it may be changed to direct current before attempting to use it for battery charging. This