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File:Syphon recorder output.png

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Syphon_recorder_output.png (600 × 110 pixels, file size: 11 KB, MIME type: image/png)

Summary

Description
English: Recording of a telegraph message from an underwater submarine telegraph cable on paper tape by a syphon recorder from around 1900. The poor transmission quality of early telegraph cables distorted the signal, making the current pulses representing "dots" and "dashes" of the Morse code very difficult to read.
Date
Source Edward M. Byrn (1900) The Progress of Invention in the 19th Century, Munn and Co., New York, Sec. 4, p. 36, fig. 16 archived on Project Gutenberg
Author

Edward W. Byrn

(Life time: Not known)


Public domain
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.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Syphon_recorder_output.png

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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Date/TimeThumbnailDimensionsUserComment
current12:25, 9 December 2013Thumbnail for version as of 12:25, 9 December 2013600 × 110 (11 KB)Mumiemonstret{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Illustration of output from the Syphon recorder used for recording the very weak telegraph signals transmitted through the first transatlantic cables.}} |Source = '''Original p...

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