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File:EastHanSeismograph.JPG

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    Original file (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.
    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
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    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

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    Items portrayed in this file

    depicts

    inception

    July 2004

    exposure time

    0.03333333333333333333 second

    focal length

    8 millimetre

    media type

    image/jpeg

    data size

    237,766 byte

    height

    552 pixel

    width

    480 pixel

    checksum

    94afa9452bb47e5945fa42dd48085e79b5320d7f

    determination method or standard: SHA-1

    File history

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    Date/TimeThumbnailDimensionsUserComment
    current13:10, 10 January 2014Thumbnail for version as of 13:10, 10 January 2014480 × 552 (232 KB)SoerfmLevels, crop
    13:10, 10 January 2014Thumbnail for version as of 13:10, 10 January 2014480 × 552 (232 KB)SoerfmLevels, crop
    14:33, 25 March 2005Thumbnail 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: Detecting a Quake

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