Later Development
In 1885 Edison again took up investigation of transmission by spark while working on a railway telegraph system and was able to get transmission of five hundred feet (Israel 1998, 239). Edison thought it might be suitable for ship-to-ship and ship-to-shore communication, taking out a patent (number 465,971) for the system. Edison did not develop the patent commercially but according to his former assistant Francis Jehl (1937), sold it to Guglielmo Marconi who developed it into radio.
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