Guglielmo Marconi
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Guglielmo Giovanni Maria Marconi, 1st Marquess of Marconi, was an Italian radio-frequency engineer, inventor, and politician known for his creation of a practical radio wave-based wireless telegraph s
Marconi in 1908
Marconi's first transmitter incorporating a monopole antenna. It consisted of an elevated copper sheet (top) connected to a Righi spark gap (left) powered by an induction coil (centre) with a telegraph key (right) to switch it on and off to spell out text messages in Morse code.
1897 illustration of Marconi with his invention
British Post Office engineers inspect Marconi's radio equipment during a demonstration on Flat Holm Island in the Bristol Channel, 13 May 1897. The transmitter is at the centre, the coherer receiver below it, and the pole supporting the wire antenna is visible at top.
K. Ferdinand Braun
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Karl Ferdinand Braun was a German applied physicist who shared the 1909 Nobel Prize in Physics with Guglielmo Marconi for their contributions to the development of radio. With his two circuit system,
The house in Fulda, Germany, where Braun was born
An early resonant transformer invented by Braun used in the coherer radio receivers in wireless telegraphy radio systems made by the Telefunken company in 1903
Braun's two circuits to send and receive