At Halsnæs, just behind the Lynæs Church in Northern Sealand a hill is named the Valdemar Poulsen Hill. A stone is placed there as a tribute to Valdemar Poulsen, the inventor of the Light Arc transmitter.
At the beginning of the 1900-years Valdemar Poulsen invented and developed a radio wave transmitter, the so-called Poulsen-arc that was able of producing high frequency continuous electromagnetic waves. In collaboration with the engineer and later professor Peder Oluf Pedersen, an improved detector, for the reception of radio waves, were developed by Poulsen. The first wireless telephony, that is wireless transmission of speech, was realized with the Poulsen system in 1907.
It was here at Lynæs on the hill behind the Church he in 1906, about 100 years ago were carrying out his experiments with the Light-Arc Transmitter. On the hill a mast was erected for the purpose of transmitting signals from the Light Arc transmitter, and next to the mast a shack for the Light Arc Transmitter was situated, where all his experiments was carried out.
Valdemar Poulsen was born on November 23, 1869 in Copenhagen. His birthplace is situated at Landemærket 3 next to the Round Tower. His father, Jonas Poulsen was educated a lawyer and was employed in the Ministry of Justice, where he later became appointed to Assessor at the Supreme Court. The father was 33 years old at the time when Valdemar were born. His mother, Rebekka Magdelene, nee. Brandt, were 21 years old. One year earlier she had given birth to the daughter Agnes, and in 1870 the daughter Fanny was born.
It came as a major blow to the family when the mother died in 1873 in her young age of 25 years.
In his boyhood Valdemar Poulsen were amused with carrying out research of electrostatic gadgets and induction apparatuses. The larger the sparks produced, the better. In the school he almost only paid attention to the teachings of physics, chemistry and drawing. And, since he didn’t have much of a talent for Math, his choice of study became that of language and history.
Valdemar Poulsen died at July 23, 1942. His grave is situated at Gentofte Cemetery.