Poulsen (1869-1942) was a Danish electrical engineer and inventor. Poulsen
invented the telegraphone for recording telephone conversations and the
Poulsen Arc Transmitter.
The arc transmitter which contrary
to all previous types of radio transmitters - generated continuous radio
waves. The transmitter was invented by the Danish engineer Valdemar Poulsen
Biography and patent drawings.
of Electromagnetic Tape Recording
Contributions to sound recording
made by Valdemar Poulsen.
of Sound Recording
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