 He contracted Fleming, an expert in power engineering, to design the radio transmitter.Fleming designed the world's first large radio transmitter, a complicated spark transmitter powered by a 25 kW alternator driven by a combustion engine, built at Poldhu in Cornwall, UK, which transmitted the first radio transmission across the Atlantic on 12 December 1901.Although Fleming was responsible for the design, the director of the Marconi Co. had made Fleming agree that