Harmonics of the 60 Hz power frequency has been around for a long time. It was observed on transmission systems in the early 1890s and was associated with voltage and current waveforms. As equipment ...

S. Parthasarathy, A. Pande and M. Pancholy 1 have recently given evidence of oscillation of the quartz crystal not only at odd harmonics but also at even and half-odd harmonics. In the third column of ...