Alexander Stepanovich Popov (sometimes spelled Popoff) was a Russian physicist Born 16 March 1859 and died 31 December 1905.
On 7 May 1895 presented a paper to the Physical and Chemical Society in St. Petersburg explaining how a lightening detector could be used as a coherer to detect radio noise from lightening strikes.
On March 24th, 1896 in a demonstration, he used radio waves to transmit a message between different campus buildings in St. Petersburg Russia. Marconi registered a patent Two Months after the demonstration.
To Learn more about Popov I have 2 links below these pictures.
Alexander Stepanovich Popov
Alexander Stepanovich Popov‘s first transciever
Want to know more, these were my souces for what I have here as well as the pictures….