The high tonal register and the "bass" or low frequencies are emphasized by turning the tone control knob.
In order to study this subject better, I carried on some experiments with excessively high potentials and low frequencies.
No doubt large coils, even if operated with currents of low frequencies, are capable of producing beautiful effects.
This experiment, however, may be performed with low frequencies, but much less satisfactorily.
You can remember that sets transmitting with long waves have low frequencies, but sets with short waves have high frequencies.
In general, arc lamps do not work very well on low frequencies.