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MANAGERS AND PROJECTIONISTS 1095
of water for analysis if necessary. This should be checked up once a year thereafter.
The rule with regard to water is : Use only distilled water in the batteries, unless your city or other water supply has been tested within one year and pronounced safe for battery use. This may be supplemented by the statement that rain water from a shingle roof is always safe for battery use. In collecting this water, allow time for the roof to be washed clean and collect the water in glass or porcelain vessels.
The foregoing comes direct from the Electric Storage Battery Company (Exide) engineering department; therefore, is official. As I have said, water from iron pipes may be all right — also it may not. It must not be used until analyzed at a laboratory and pronounced safe.
Never permit the water level to drop below the tops of the plates. In glass jars fill to the water line. With rubber jars, fill to just below the lower end of the filling tube.
To allow the water to drop below the tops of the plates permits as much of the plates as are exposed to the air to dry out and thereafter that portion of the plate will have no chemical reaction, hence be dead. This will, of course, reduce the battery capacity exactly in proportion to the percentage of plate area exposed to the air.
Once rendered dead in this manner, the surface can only again be made active by an elaborate process at the factory, and since this wrould be prohibitive in cost, the effect is that the battery is permanently disabled. Moreover, there is a permanent deterioration of that portion