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To the Editor:
—Some years ago I began to seek for some method of increasing the life and efficiency of dry cells. I at first employed the usual methods (potassium permanganate and sal ammoniac solutions, etc.). These proving unsatisfactory, I at last hit on the following simple but cheap and satisfactory method:When my dry battery has become exhausted, I take an ordinary ⅜-inch drill-bit of sufficient length and drill a hole as near as possible to the carbon and between the carbon and the outside zinc covering. This hole should reach to within I inch of the bottom of the cell, beginning, of course, at the top or sealed part of the battery. I shake out of the cell all loose dust and particles, and place in this hole a 1½-ounce glass funnel, having a stem not less than 1% inches in length, and of sufficient thickness to fit
Hanson EM. Method of Increasing the Efficiency and Life of the Dry-Cell Battery. JAMA. 1909;LIII(15):1205. doi:10.1001/jama.1909.02550150061013
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