File:Goldschmidt alternator rotor 1924.jpg
Goldschmidt_alternator_rotor_1924.jpg (563 × 390 pixels, file size: 48 KB, MIME type: image/jpeg)
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[edit]DescriptionGoldschmidt alternator rotor 1924.jpg |
English: A disassembled 100 kW Goldschmidt alternator radio transmitter at Eilvese, Germany in 1924, showing the large rotor. The Goldschmidt alternator, invented in 1908 by Rudolph Goldschmidt, was a rotating machine used as a radio transmitter briefly during the 1920s. It was used in a few super power longwave radiotelegraphy stations to transmit transoceanic telegram traffic between nations. The Eilvese station was Germany's main contact with the outside world during World War 1 and was used, along with a sister station in Tuckerton, New Jersey, USA, by US President Woodrow Wilson and Kaiser Wilhelm to negotiate the Armistice which ended World War 1.
The Goldschmidt machine was turned by a 250 HP DC motor at 3000 RPM, and transmitted up to 100 kW of output power at 24 kHz, which drove an enormous antenna consisting of a ring of 390 ft. steel masts 3000 ft.in diameter, connected by an umbrella-shaped network of wires. The rotor weighs several tons and rotates with a narrow clearance of 0.8 mm within the stator assembly. To prevent eddy current losses it is made of thin 0.5 mm steel laminations separated by paper sheets. Français : Un émetteur radio à alternateur de Goldschmidt de 100 kW démonté à Eilvese, en Allemagne, en 1924, montrant le grand rotor. L'alternateur de Goldschmidt, inventé en 1908 par Rudolph Goldschmidt, était une machine rotative utilisée brièvement comme émetteur radio dans les années 1920. Il a été utilisé dans quelques stations de radiotélégraphie à ondes longues superpuissantes pour transmettre des télégrammes transocéaniques entre pays. La station d'Eilvese était le principal contact de l'Allemagne avec le monde extérieur pendant la Première Guerre mondiale et a été utilisée, avec une station sœur à Tuckerton, New Jersey, États-Unis, par le président américain Woodrow Wilson et le Kaiser Wilhelm pour négocier l'armistice qui a mis fin à la Première Guerre mondiale.
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Date | |
Source | Retrieved July 17, 2014 from Albert Neuberger, "The Star Antenna of Eilvese" in Radio News magazine, Experimenter Publishing Co., New York, Vol. 5, No. 8, December 1924, p. 1050 archived on American Radio History website |
Author | Albert Neuberger |
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[edit]Public domainPublic domainfalsefalse |
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Goldschmidt_alternator_rotor_1924.jpg |
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