Valdemar Poulsen

Valdemar Poulsen 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, which was used for a majority of the earliest audio radio transmissions, before being supplanted by the development of vacuum-tube transmitters.

23 November 1869

Born on the same birth date (23 November 1869): Johan Scharffenberg

Born on the same birth day (23 November): Anthonie Heinsius • Donald Nixon • Francis, Duke of Brunswick-Lüneburg • Jean Mabillon • Jean-Baptiste Senaillé • Kirsty Young • Manuel Fraga • Manuel dos Reis Machado • Marilyn Kidd • Martin Kent • Mary Brewster Hazelton • Maxwell Caulfield • Myriam Boileau • Paul Wilson (footballer, born 1950) • Prospero Alpini • Robert Towne • Shaun Hutchinson • Spranger Barry • Steven Brust • Tony Pond

Born in the same month (November 1869): Ariadna Tyrkova-Williams • Ben B. Lindsey • Gaetano Bresci • Gustaf Dalén • Helene Stöcker • James Hamilton, 3rd Duke of Abercorn • Johan Scharffenberg • John Lumsden • Josaphata Hordashevska • Marie Dressler • Maud of Wales • Victor Emmanuel III • Zinaida Gippius • Óscar Carmona