Telegraphone

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Related to Valdemar Poulsen: Telegraphone

Te`leg´ra`phone


n.1.An instrument for recording and reproducing sound by local magnetization of a steel wire, disk, or ribbon, moved against the pole of a magnet connected electrically with a telephone receiver, or the like.
References in periodicals archive ?
1869: Valdemar Poulsen, Danish inventor of the tape recorder, which he patented in 1898, was born.
1869: Valdemar Poulsen, Danish inventor of |the tape recorder, which he patented in 1898, was born.
ST GEORGE'S DAY IN GEORGIA 1869: Valdemar Poulsen, Danish inventor of the tape recorder, patented in 1898, was born.
While there has been a great deal of invention, the basic science--like Valdemar Poulsen's discovery more than 100 years ago--has remained relatively constant.
The principle of recording on mag-netic tape was first outlined by Danish inventor Valdemar Poulsen in 1889.
In the late 1890s, Valdemar Poulsen worked in the technical department of the Copenhagen Telephone Company, and also had regular contact with researchers at the Great Northern Telegraph Company.(4) Poulsen was familiar with the state of the art in both telegraph and telephone technology, and worked as a troubleshooter.
Even Valdemar Poulsen had changed his mind after two years of unsuccessful efforts to develop a telephone answering machine together with technicians at Mix & Genest and Siemens & Halske.
1899 marked the beginning of the first revolution in magnetic recording technology as Valdemar Poulsen of Denmark invented and patented the first true magnetic recorder, the Telegraphone.
1499: Perkin Warbeck, the imposter claiming to be the Duke of York, was hanged at the Tower of London 1852: Britain's first pillar box was erected in Jersey 1859: Outlaw Billy the Kid (William H Bonney) was born 1869: Valdemar Poulsen, Danish inventor of the tape recorder, which he patented in 1898, was born 1887: Boris Karloff, actor best-known for horror roles, was born in London 1888: Harpo Marx, the Marx Brother who never spoke on screen, was born 1910: Dr Hawley Harvey Crippen, who poisoned his wife to seek a new life with his lover, Ethel Le Neve, was hanged at Pentoville Prison 1963: The first episode of the BBC TV serial Dr Who was screened in Britain.
(William H Bonney) was born 18 69 : Valdemar Poulsen, Danish inventor of the tape recorder, which he patented in 1898, was born 1887: Boris Karloff, actor best-known for horror roles.
1869 - Valdemar Poulsen, Danish inventor of the tape recorder, which he patented in 1898, was born.