High frequencies are especially wanted, for practical considerations make it desirable to keep down the potential.
When high frequencies are used, it is of equal importance to combine a condenser with the primary.
Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases.
With high frequencies the observations are not sufficiently reliable to draw a conclusion.
You can remember that sets transmitting with long waves have low frequencies, but sets with short waves have high frequencies.