Peter L. Jensen
| Peter L. Jensen | |
|---|---|
| Born |
Peter Laurits Jenson 16 May 1886 Falster, Denmark |
| Died | 26 October 1961 (aged 75) Western Springs, Illinois, United States |
| Occupation | Engineer, inventor, entrepreneur |
Peter Laurits Jensen (16 May 1886 – 26 October 1961) was a Danish American engineer, inventor and entrepreneur. He founded Magnavox Company and Jensen Radio Manufacturing Company.
Peter Laurits Jensen was born on the island of Falster in Denmark during 1886. His education was in Danish high schools from which he graduated in 1902. He died in Western Springs, Illinois during 1961 at the age of 75.
He began employment as an apprentice in the laboratory of Valdemar Poulsen, the inventor of magnetic recording and the Poulsen System of Radio in 1903. Became assistant to Poulsen in 1905 and was sent to the United States to assist in introducing the Poulsen Radio Arc System in 1909. He was employed as engineer by the Federal Telegraph Company in California, which purchased the Poulsen patent, until November 1910.
In 1911, he founded the Commercial Wireless and Development Co., together with Edwin S. Pridham (1881–1963) and with financial backing from Richard O'Conner, Jensen and Pridham moved from Napa, California in 1916, and changed the company name in 1917 to the Magnavox Company. Jensen was employed as chief engineer until 1925.
He built with Edwin S. Pridham the first moving coil loudspeaker in 1915. Called the moving coil principle, the electro-dynamic principle from which the term dynamic speaker later evolved. In 1916 he built and patented the first contained and complete electric reproducing phonograph. Made the first public address system and used on Christmas Eve in 1915 in San Francisco at a gathering where 75,000 people were present and who heard distinctly all the speeches and announcements. The public address systems under the name of Magnavox were used all over the United States. It was used by U.S. President Woodrow Wilson in 1919. World-wide there were no other companies manufacturing public address systems until 1920. He designed the Magnavox dynamic loudspeaker for reception of radio broadcasting in 1919.
He also invented and patented, with Edwin S. Pridham, the first anti-noise self-neutralizing microphone in 1917 which allowed wireless communication between aircraft and the ground. This type later became known as the lip microphone, widely used in the First and Second World Wars.
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