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.
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