RT Journal
A1 Hanson EM
T1 MEthod of increasing the efficiency and life of the dry-cell battery
JF Journal of the American Medical Association
JO Journal of the American Medical Association
YR 1909
FD October 9
VO LIII
IS 15
SP 1205
OP 1205
DO 10.1001/jama.1909.02550150061013
UL http://dx.doi.org/10.1001/jama.1909.02550150061013
AB 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