File:EastHanSeismograph.JPG

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

This file is from Wikimedia Commons and may be used by other projects. The description on its file description page there is shown below.

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.
w:en:Creative Commons
attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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

Captions

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Items portrayed in this file

depicts

inception

July 2004

exposure time

0.03333333333333333333 second

focal length

8 millimetre

MIME type

image/jpeg

File history

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Date/TimeThumbnailDimensionsUserComment
current15:10, 10 January 2014Thumbnail for version as of 15:10, 10 January 2014480 × 552 (232 KB)wikimediacommons>SoerfmLevels, crop

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