That delicate instrument the radiophone, constructed on this principle, has wide analogies with the apparatus of to-day.
Sec.

6 Starting from the experiments of Hertz, the history of wireless telegraphy almost merges into that of the researches on electrical waves.

All the progress realised in the manner of producing and receiving these waves necessarily helped to give rise to the application already indicated.

The experiments of Hertz, after being checked in every laboratory, and having entered into the strong domain of our most certain knowledge, were about to yield the expected fruit.
Experimenters like Sir Oliver Lodge in England, Righi in Italy, Sarrazin and de la Rive in Switzerland, Blondlot in France, Lecher in Germany, Bose in India, Lebedeff in Russia, and theorists like M.H.
Poincare and Professor Bjerknes, who devised ingenious arrangements or elucidated certain points left dark, are among the artisans of the work which followed its natural evolution.
It was Professor R.Threlfall who seems to have been the first to clearly propose, in 1890, the application of the Hertzian waves to telegraphy, but it was certainly Sir W.Crookes who, in a very remarkable article in the _Fortnightly Review_ of February 1892, pointed out very clearly the road to be followed.

He even showed in what conditions the Morse receiver might be applied to the new system of telegraphy.
About the same period an American physicist, well known by his celebrated experiments on high frequency currents--experiments, too, which are not unconnected with those on electric oscillations,--M.
Tesla, demonstrated that these oscillations could be transmitted to more considerable distances by making use of two vertical antennae, terminated by large conductors.
A little later, Sir Oliver Lodge succeeded, by the aid of the coherer, in detecting waves at relatively long distances, and Mr Rutherford obtained similar results with a magnetic indicator of his own invention.
An important question of meteorology, the study of atmospheric discharges, at this date led a few scholars, and more particularly the Russian, M.Popoff, to set up apparatus very analogous to the receiving apparatus of the present wireless telegraphy.