Lysbuen Traditional Geocache

I Nordsjælland, på Halsnæs, lige bag Lynæs kirke er der en høj som hedder Valdemar Poulsens Høj, der står der en sten til minde om Valdemar Poulsen, opfinderen af Lysbue-senderen.

I begyndelsen af 1900-årene opfandt og udviklede Valdemar Poulsens en radiosender, den såkaldte Poulsen-bue, der kunne producere højfrekvente kontinuerte elektromagnetiske bølger. En forbedret detektor til modtagelse af radiobølgerne udviklede Poulsen i samarbejde med ingeniøren, den senere professor Peder Oluf Pedersen. Første trådløse telefoni, dvs. trådløs overførsel af tale blev praktiseret med Poulsens system i 1907.

Det var her i Lynæs på højen bag kirken at han i 1906, altså for 100 år siden ekperimenterede med sin Lysbue-sender, på højen havde man rejste en mast som skulle transmitere signalerne fra Lysbue-senderen, ved siden af masten havde man bygget et skur hvor Lysbue-senderen stod og hvor ekperimenterne foregik.

Valdemar Poulsen blev født den 23. november 1869 i København. Hans fødehjem er beliggende Landemærket 3 lige ved siden af Rundetårn. Hans far Jonas Poulsen var uddannet jurist og ansat som assistent i Justitsministeriet, hvor han senere blev højesteretsassessor. Faderen var 33 år da Valdemar blev født. Moderen, Rebekka Magdelene, født Brandt, var 21 år, da Valdemar blev født. Et år tidligere havde hun født datteren Agnes, og i 1870 fødtes datteren Fanny. En stor sorg for familien var det, da moderen døde i 1873 kun 25 år gammel.

Som dreng morede Valdemar Poulsen sig med at udføre forsøg med elektrostatiske apparater og induktionsapparater. Desto større gnister han kunne frembringe, desto bedre. I skolen interesserede han sig næsten kun for fagene fysik, kemi og tegning. Til gengæld var matematik ikke hans stærke side, så derfor valgte han at blive sproglig-historisk student.

Valdemar Poulsen døde den 23. juli 1942. Han ligger begravet på Gentofte Kirkegård.

A t 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.

A t 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.

I t 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.

V aldemar 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.

I t came as a major blow to the family when the mother died in 1873 in her young age of 25 years.

I n 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.

V aldemar Poulsen died at July 23, 1942. His grave is situated at Gentofte Cemetery.

This Cache also serves as a tribute to my very good friend Eivind, nicknamed "Lysbuen" (Light Arc), that I have known for so many years.
His homepage is www.Lysbuen.dk