Nikola Tesla's Work In Wireless Power Transmission Page 27

FOURIER TRANSFORM AMPLITUDE OF OBSERVED WAVEFORM 3 CYCLES X 70 DIVISIONS AMPLITUDE, |F(w,d)|, VOLTS/METER FREQUENCY, f, KILOCYCLES (2·10⁻²) (1·10⁻¹) 0.8(10⁻⁴) 0.6(10⁻⁴) 0.4(10⁻⁴) 0.2(10⁻⁴) 1.0 10 100 10 9 8 7 6 5 4 3 2 9 8 7 6 5 4 3 2 1