Abstract
Variation of Metallic Conductivity with Electrostatic Charge.---Last year Perkins reported a positive result. His experiment has been repeated, using a fine copper wire, 0.08 mm. in diameter, in series with a sensitive galvanometer, as the insulated secondary of a transformer. The galvanometer was found to read the same whether the potential of this wire was + 6,000 volts or - 6,000 volts with reference to the primary which was grounded. This negative result shows that the resistance of this wire is changed, if at all, by not more than one part in five million even when the potential gradient at the surface is raised to about 150,000 volts (root mean square value) per centimeter.
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