. Science . To avoid this danger the form of batteryshown in Fig. 2 has proved convenient. Togive the same current the lamps G and C inFig. 2 must be twice the size (twice the cur-rent consumption and illuminating power, orin other words half the resistance) of C in. Fig. 1. As both sides of the battery are thenthe same, it does not matter whether 4 or 5 isthe live wire, nor which way the plug is putinto the socket, li E ot P happens to toucha grounded object, the lamp on that side merely June IS, 1915] SCIENCE 911 brightens (they are usually barely luminous),while that on the other side becom


. Science . To avoid this danger the form of batteryshown in Fig. 2 has proved convenient. Togive the same current the lamps G and C inFig. 2 must be twice the size (twice the cur-rent consumption and illuminating power, orin other words half the resistance) of C in. Fig. 1. As both sides of the battery are thenthe same, it does not matter whether 4 or 5 isthe live wire, nor which way the plug is putinto the socket, li E ot P happens to toucha grounded object, the lamp on that side merely June IS, 1915] SCIENCE 911 brightens (they are usually barely luminous),while that on the other side becomes entirelydark. For most physiological purposes a suffi-


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