Ultra-Short-Wave Therapy in Medical Practice

are the basis of visible and still shorter wave radiations. The electric waves in the narrow sense of the Hertzian waves occur as the result of oscillations of fairly large electric charges in oscillatory circuits. With a frequency of 10s cycles per second the wave-length is 3 metres and with 107 cycles per second it is 30 metres. The wave-lengths we are now concerned with are generally between 3 and 30 metres. Waves under 100 metres are called short while those under 10 metres are termed very short or ultra-short. Generally speaking, it is the electric field, as it exists between the condenser plates of a closed oscillatory circuit, and not the electromagnetic waves that is more used and as such it is not quite correct to name it ' Short-Wave Therapy '