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Various methods of measuring radio (high) frequency resistances, the power factor or phase difference of radio condensers, the sharpness of a resonance curve, and the decrement of a wave have been given. It is proposed in this paper: (1) to show that these quantities all express essentially the same physical magnitude and hence a single process of measurement gives them all; (2) to derive and classify the methods of measurement; (3) to describe improvements in these measurements. RELATIONS OF THE QUANTITIES The principal difference between the phenomena of radio (high) and audio (low) frequency is the importance of capacity,,

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