low frequency

The only explanation of this marvelous process given is that the inventor used very low frequency wireless waves in a new way.

Some of the vibrations are of high enough frequency to be audible, while others are of very low frequency.

The two sets of figures show some corroborative features, notably the low frequency from 1860 to 1870.

When fitted with a spark gap the high voltage, low frequency currents are converted into high voltage, high frequency currents.

The low-frequency ringers have the largest weights and the high-frequency the smallest, of course.