A New Determination of the Ratio of the Electromagnetic to the Electrostatic Unit of Electricity (Classic Reprint) - Tapa blanda

Excerpt from A New Determination of the Ratio of the Electromagnetic to the Electrostatic Unit of Electricity

One of us published1 a determination of v in 1889, made at the Johns Hopkins University, using the spherical condenser which had been employed by Rowland ten years before, deriving V from the ratio of the electrostatic to the electromagnetic capacity of the con denser. This is probably the best of all the methods yet employed for determining the ratio of the units. By this method V is determined in terms of a resistance, but inasmuch as V is equal to the square root of the ratio of the capacities, the uncertainty due to an error in the value of the ohm is divided by two, so that if we admit an uncertainty of two parts in five thousand in the value of the inter national ohm, that would involve an uncertainty of only one part in five thousand in V. All of the methods of determining V which do not involve the ohm are subject to even larger uncertainties in other directions. Hence it seemed to us desirable to make a new deter mination of the value of V, using the method of capacities, and to undertake to attain a higher order of accuracy than had heretofore been realized.

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