Valdemar Poulsen was a Danish engineer who invented the magnetic recorder in 1898. His ideas were the basis of magnetic recording and led to crucial developments in communications and computer technology. Born in Copenhagen on November 23, 1869,...

1869-1942 Danish engineer who invented the telegraphone, the first practical device for recording and replaying sound—the forerunner of modern audio and video recording systems. Poulsen developed the telegraphone, an electromagnetic phonograph...

Valdemar Poulsen (November 23, 1869, in Copenhagen – July 23, 1942) was a Danish engineer. He developed a magnetic wire recorder in 1899. The magnetic recording was demonstrated in principle as early as 1898 by Valdemar Poulsen in his Telegraphone....