File:Time clocks-1905.jpg
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Time_clocks-1905.jpg (231 × 254 pixels, file size: 33 KB, MIME type: image/jpeg)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
DescriptionTime clocks-1905.jpg |
English: Precision pendulum regulator clocks at the United States Naval Observatory in 1905 which generated the time signal sent out at noon every day to all parts of the US by telegraph lines, serving as the primary time standard used to set accurate clocks throughout the US. These two clocks were synchronized to a third precision pendulum clock, the "star clock", which was set by the time of passage of stars overhead. From the source:
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Date | |
Source | Scanned from Walden Fawcett, "Distribution of Time Signals", The Technical World magazine, May 1905, p. 24 on https://earlyradiohistory.us website |
Author | Unknown authorUnknown author |
Licensing
Public domainPublic domainfalsefalse |
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.
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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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Original upload log
The original description page was here. All following user names refer to en.wikipedia.
- 2005-05-30 16:37 Ihcoyc 245×289× (13531 bytes) Automatic [[time signal]] clocks in use in [[1905]] to coordinate time with the [[United States Naval Observatory]] by [[telegraphy]]. Scanned from a 1905 magazine, originally published to the Web at http://earlyradiohistory.us/1905tim.htm {{PD}}
Items portrayed in this file
depicts
1905
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:06, 9 January 2012 | 231 × 254 (33 KB) | wikimediacommons>Jahoe | Cropped (removed caption text and white borders). |
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