In the following weeks he made extensive experiments on this matter. With his circuits he produced electro magnetic waves on a broad band of frequencies (some authors mentioned a wavelength of 7.5 m !). At his laboratorium he examines the waves with the resonator and finds maxs and mins of the waves amplitudes by looking at the spark with a magnifying glass. He quatified the strength of the spark and concluded to have produced a very high frequency.

Hertz published his findings. Other physicists repeated the experiments and confirmed his findings. Asked upon the usefullness of his finding Hertz stated:

The Hertz experiment:
E = Energiequelle (Batterie), T = Taster, J = Induktionsspule, O = Wellensender (Oszillator)
R = Resonator.

When a spark occurres, then electromagnetic waves where produced at the wavetransmitter O and are recognizable at some meters apart. Tiny sparks were recognazied at the resonator R. (Source(1): Dr. F. Fuchs, Der praktische Radionamateur, 1924, Stuttgart, Franksche Verlagshandlung)

Hertz did not worked any longer on this field of physics.

Nobody took any serious care on electromagnetic waves for about 10 years

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