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File:Faraday disk generator.jpg

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Summary

Description
English: Drawing of Faraday disk, the first electromagnetic generator, invented by British scientist Michael Faraday in 1831. The copper disk (D) rotated between the poles of a horseshoe shaped magnet (A), creating a potential difference between the axis and rim due to Faraday's law of induction. If an electrical circuit such as a galvanometer was connected between the binding posts (B) and (B') the motion induced a radial flow of current in the disk, from the axle toward the edge. The current flows into the spring contact (m) sliding along the edge of the disk, out of binding post (B') through the external circuit to binding post (B) , and back into the disk through the axle. Turning it in the opposite direction reverses the direction of current. The caption also says that passing a current from a Bunsen cell (battery) through it would cause the disk to turn, making it function as an electric motor. The labeled parts are given in the caption as:
  • (A) inducing magnet
  • (D) induced disk
  • (B) binding-screw for current entering or exiting axis of disk
  • (B') binding-screw for current entering or exiting circumference of disk
  • (m) rubber (sliding spring contact) for edge of disk.

The caption describes it as 'Foucault's and Le Roux's apparatus' so this picture was not drawn from Faraday's original machine, but one owned by Faraday's contemporary French physicist Léon Foucault. The Faraday disk was an inefficient generator because counter-currents flowed back through regions of the disk outside the magnetic field. It was the first homopolar generator

Alterations to image: cropped out caption and list of parts.
Date
Source Downloaded from Émile Alglave & J. Boulard (1884) The Electric Light: Its History, Production, and Applications, translated by T. O'Conor Sloan, D. Appleton & Co., New York, p.224, fig.142 on Google Books
Author Émile Alglave
Permission
(Reusing this file)		 Public domain - published in USA before 1923

Licensing

Public domain
Public domain
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
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.

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1884

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Date/TimeThumbnailDimensionsUserComment
current07:30, 26 September 2021Thumbnail for version as of 07:30, 26 September 20211,920 × 1,500 (1.31 MB)Vortbetter quality
03:34, 22 December 2007Thumbnail for version as of 03:34, 22 December 2007487 × 382 (35 KB)Chetvorno{{Information |Description=Drawing of Faraday disk, the first electric generator, invented by British scientist Michael Faraday in 1831. |Source=Downloaded from [http://books.google.com/books?id=zh5pbMMwARQC&pg=PA224 Émile Alglave & J. Boulard (1884) '

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Quelle: https://en.wikipedia.org/wiki/File:Faraday_disk_generator.jpg