English: A
Goldschmidt alternator, a rotating machine developed in 1908 by
Rudolph Goldschmidt for use as a
radio transmitter. This example has an output power of 12.5 kW and efficiency of 80% at a frequency of 30 kHz, and 8 to 10 kW at a frequency of 60 kHz. It was installed 1910 by C. Lorentz Co. at their Eberswald wireless station. It consists of a DC motor (left) which drives the alternator (right) through a geartrain (center). In order to produce high frequencies the alternator rotor and stator have a large number of poles, usually 200 to 400. The unique advantage of the Goldschmidt machine was that its rotor and stator were connected to
tuned circuits - "reflector circuits" (capacitor bank visible on back wall) - which caused the machine to produce its output power at a multiple (
harmonic) of its rotational rate, so it could produce high frequencies without the high rotational speed that the
Alexanderson alternator required.
The crosshatch (stripe) pattern in the background is not a part of the original image but an aliasing artifact introduced by scanning of the original halftone photo.
This media file is in the public domain in the
United States. This applies to U.S. works where the copyright has expired, often because its first
publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See
this page for further explanation.
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See
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Wikipedia:Copyrights for more details.
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English: A
Goldschmidt alternator, a rotating machine developed in 1908 by
Rudolph Goldschmidt for use as a
radio transmitter. This example has an output power of 12.5 kW and efficiency of 80% at a frequency of 30 kHz, and 8 to 10 kW at a frequency of 60 kHz. It was installed 1910 by C. Lorentz Co. at their Eberswald wireless station. It consists of a DC motor (left) which drives the alternator (right) through a geartrain (center). In order to produce high frequencies the alternator rotor and stator have a large number of poles, usually 200 to 400. The unique advantage of the Goldschmidt machine was that its rotor and stator were connected to
tuned circuits - "reflector circuits" (capacitor bank visible on back wall) - which caused the machine to produce its output power at a multiple (
harmonic) of its rotational rate, so it could produce high frequencies without the high rotational speed that the
Alexanderson alternator required.
The crosshatch (stripe) pattern in the background is not a part of the original image but an aliasing artifact introduced by scanning of the original halftone photo.
This media file is in the public domain in the
United States. This applies to U.S. works where the copyright has expired, often because its first
publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See
this page for further explanation.
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See
Wikipedia:Public domain and
Wikipedia:Copyrights for more details.
Information
Captions
Add a one-line explanation of what this file represents