Valdemar Poulsen - Wikipedia
WEBValdemar Poulsen (23 November 1869 – 6 August 1942) was a Danish engineer who developed a magnetic wire recorder called the telegraphone in 1898.
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Poulsen-Buesender - Wikipedia, den frie encyklopædi
WEBEn Poulsen-Buesender eller buegenerator (engelsk: The Arc Transmitter; The Poulsen Arc; The Poulsen System) er et apparat til at konvertere jævnstrøm til radiofrekvenser, og det …
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Milestones : Poulsen-Arc Radio Transmitter, 1902 - ETHW
WEBDec 13, 2019 · Valdemar Poulsen, a Danish engineer, invented an arc converter as a generator of continuous-wave radio signals in 1902. Beginning in 1904, Poulsen used the arc for experimental radio …
Valdemar Poulsen | Lemelson
WEBIn 1903, he developed an arc transmitter, which enabled speech to be transmitted up to a radius of 150 miles. This was a significant improvement over the arc transmitter invented by William Duddell in 1900; by 1920, …
Valdemar Poulsen - Engineering and Technology …
WEBIn 1903 Poulsen developed an improved continuous arc transmitter that could operate at higher frequencies (up to 100 kHz) and it allowed the transmission of sounds up to 240 km (150 miles). For a few years, the …
Valdemar Poulsen - Federal Telegraph Company Arc Wireless …
WEBThe method of generating continuous electric waves by means of a light arc was invented by the Danish engineer Valdemar Poulsen (1869 - 1942) in 1902 as a modification of …
Broadcast Transmitter Development - The Radio …
WEBIn the early 1900’s, there were only two devices that were capable of generating a continuous wave – an arc transmitter and a high-frequency alternator. The arc transmitter was conceived by the Danish inventor …
Valdemar Poulsen, inventor of the answering machine
WEBSep 10, 2021 · Answering machine. In 1904 Poulsen developed a recording device especially for the telephone: the answering machine. Initially, this early telephone …
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