Who is valdemar poulsen

When a recording was complete, the battery was disconnected and a telephone receiver was connected instead. The electromagnet would return to its starting point and when freed to move along the wire again, the recording would be replayed. Austrian emperor Francis Joseph spoke into it at the exhibition, and the words he spoke are believed to be the earliest surviving magnetic recording.

In , J. O'Neill replaced the wire with a magnetically coated ribbon, which would later dominate the recording industry. Meanwhile Poulsen continued to work on communications technologies. In , he developed an arc transmitter, which enabled speech to be transmitted up to a radius of miles. Poulsen also worked on the first version of the hard disk.

His steel disk had a raised spiral on its surface which was traced by an electromagnet as the disk rotated. In he exhibited his invention at the Paris Exposition, making a recording of Austrian emperor Francis Joseph, which is believed to be the earliest surviving magnetic recording. Poulsen was born on 23 November in Copenhagen. His father, a judge who served on the Danish High Court, wanted his son to become a doctor, and he did attend medical school for a short time, but at 24 he went to work as a technician for the Copenhagen Telephone Company.

These particles were to be magnetised in accordance with the alternating current from a microphone source. Smith also discussed the possibility of using a hard steel wire but thought it scarcely possible. A working unit was never built.

All magnetic recordings whether wire, tape, or disc follow the same principle. As magnetic material is drawn past the recording head, it becomes and remains magnetised. The system was able to communicate between Lyngby and Newcastle with a foot mast. Click Here to Know about a Legend Dr. Abdul Kalam. Toggle navigation Menu. Social Discuss Sign Up Login. Valdemar Poulsen Popular Inventions. Home inventors Valdemar Poulsen. Valdemar Poulsen - Famous Inventor. About Inventor Valdemar Poulsen was a Danish engineer who developed a magnetic wire recorder in Early Life He was born on 23 November in Copenhagen.