Valdemar Poulsen

Valdemar Poulsen
Valdemar Poulsen (c. 1898)
Born	23 November 1869 Copenhagen, Denmark
Died	23 July 1942(1942-07-23) (aged 72) Gentofte, Denmark
Nationality	Danish
Occupation	Engineer
Engineering career
Projects	magnetic wire recorder, arc converter radio transmitter

Valdemar Poulsen (23 November 1869 – 6 August 1942) was a Danish engineer who developed a magnetic wire recorder called the telegraphone in 1898. He also made significant contributions to early radio technology, including the first continuous wave radio transmitter, the Poulsen arc, ^[1] which was used for a majority of the earliest audio radio transmissions, before being supplanted by the development of vacuum-tube transmitters.^[2]