of these batteries operatean electric fan very successfully, also portable minia-ture electric flash lights and gas lighters. Its con-stancy of output of current is one of its specialfeatures. The manufacturers, who control the battery forthe American continent, are the Hydra Double BatteryCompany,… … THE HYDBA DOUBLE SEMI-DBY BATTEBY. able compensation therefor. They also guarantee thecapacity of every battery they make. There is no question that a battery of the characterdescribed should come into general use and prove veryeffective for all classes of open-circuit work. m «t» m A painstaking…
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