Professors Elihu Thomson and E . J . Houston in 1876 made a number of experiments and observations on high frequency oscillatory discharges.
2.
He demonstrated that there were three kinds of electric arc : the primitive arc of William Duddell, the secondary arc of Valdemar Poulsen, and a succession of oscillatory discharges.
3.
In the years 1887-8, Lodge, Fitzgerald, and others were investigating the nature of these oscillations, and the manner in which they are guided by conducting wires, when Hertz conceived the idea of investigating the disturbances caused by such oscillatory discharges in the surrounding space.
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