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Wireless Telegraphy 5 force with galling frequency. But notwithstanding these maddening interruptions Marconi stuck to his task, and finally enjoyed the satisfaction of being able to transmit his signals through space from one station to another four miles away. The success was complete. The ability to main- tain conversation by the dots and dashes of the Morse code through space and without the assistance of connecting wires was established conclusively. Now it was merely a matter of development, improvement of details and instruments, and this work could only be satisfactorily accomplished by unremitting ex- periment. Signor Marconi, having convinced his friends and having secured the necessary financial and technical assistance to consummate the desired end of being able to talk round the world if necessary, resumed his experiments with redoubled energy. Wireless telegraphy had been lifted out of the rut of laboratory experiment into the channel of practical utilisation. It has been asserted that Signor Marconi did not invent wireless telegraphy. From the pedantic view- point this contention may possibly be correct. In 1887 a German scientist, Heinrich Hertz, startled the scientific world by announcing that he had succeeded in sending invisible electro-magnetic waves through the ether with the velocity of light waves—that is, at the speed of 186,000 miles per second. Hertz had been attracted to this field of endeavour by those famous British scientists, Michael Faraday, Thomson and Clerk Maxwell. These three experimenters did not carry their researches to their logical conclusion, but merely indicated the broad path for future investigation,