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File:EastHanSeismograph.JPG

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EastHanSeismograph.JPG(480 × 552 pixels, file size: 232 KB, MIME type: image/jpeg)

Summary

Description
English: A replica of an ancient Chinese Seismograph from Eastern Han Dynasty (25-220 CE).
This picture is taken from an exhibition at Chabot Space & Science Center in Oakland, California.
The plaque of the exhibit said:
Detecting a Quake
In 132 CE, after several earthquakes in China, astronomer Zhang Heng invented this instrument to warn people of the next one. When the ground shook, it moved a pendulum inside the jug. The pendulum pushed a lever that opened one dragon's mouth. A ball rolled out and into the toad's mouth below, sounding an alarm. The open dragon mouth pointed in the direction of the earthquake, notifying the Emperor.
Date
Source en:File:EastHanSeismograph.JPG
Author en:user: Kowloonese

Licensing

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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This licensing tag was added to this file as part of the GFDL licensing update.

Original upload log

The original description page was here. All following user names refer to en.wikipedia.

Upload date | User | Dimensions | Comment
04:08, 12 July 2004 |480 × 585 (87 KB) | Kowloonese (talk | contribs) | Ancient Chinese Siesmograph from Eastern Han Dynasty

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July 2004

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Date/TimeThumbnailDimensionsUserComment
current 13:10, 10 January 2014 Thumbnail for version as of 13:10, 10 January 2014480 × 552 (232 KB)SoerfmLevels, crop
13:10, 10 January 2014 Thumbnail for version as of 13:10, 10 January 2014480 × 552 (232 KB)SoerfmLevels, crop
14:33, 25 March 2005 Thumbnail for version as of 14:33, 25 March 2005480 × 585 (87 KB)ShizhaoA replica of an ancient Chinese Siesmograph from Eastern Han Dynasty (25-220 CE) This picture was taken in July 2004 from an exhibition at Chabot Space & Science Center in Oakland California. The plaque of the exhibit said: <b>Detecting a Quake</b> <br>

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