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Show HERE'S RULE FOR TESTING BATTERIES i "Taking a hydrometer reading of ons eell of a storage battery does not indicate indi-cate the condition of the entire battery," bat-tery," says Mr. E. E. Darling of the Preet-O-I.he Battery Service station, lit Eaat Second South street. "A storage battery is mads up of a number of cHls, each ceil a complete unit, In Itself; ths number of cells la Indicated by the number of rubber screw caps on ths top of ths battsry. Rach eell contains a series sf plates snd Its own supply of acid solution or electrolyte. They are In reality, separate separ-ate two-volt units, connected In series to obtsln the desired voltage for the atartlng and lighting system. Each unit should bs tested with a hydrometer hydrome-ter and an average taken to determine ths condition of the battery. "If thei specific gravity In any cell tests reort. than . twenty-five points lower than "the other cells. It Is an Indication In-dication that thle call Is out of order. Ths condition may bs due to short circuits Insids ths cell: putting too much water In the cell causing ths electrolyte to overflow, weakening the solution; or loss of electrolyte due to a cracked or leaky Jar. "The evaporation of distilled water should bs about tbs same In all colls. If ths solution In any ona cell becomes considerably lower than that In ths other cells It Is an Indication that tbs jar of that eell la cracked or leaky and It should 'bo replaced at ones to prevent pre-vent total loss of ths solution and consequent con-sequent Injury to ths battery. |