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OUR earliest knowledge of electricity was of the static kind; later came the voltaic cell and the direct current. But not until the discovery of alternating or oscillating currents of electricity could the phenomenon of electrical resonance make its appearance. Today, as we turn the dials of our radio receivers and “tune in” on the station we want it is recognized how widespread its application has become. Nevertheless, it seems that few have given thought to how this important principle came to light and how and when it got into common use.