File:EastHanSeismograph.JPG

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EastHanSeismograph.JPG (480 × 552 pixels, dimension del file: 232 KB, typo MIME: image/jpeg)

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Summario

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.
Data
Origine en:File:EastHanSeismograph.JPG
Autor en:user: Kowloonese

Licentia

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attribution condivider equalmente 		Iste file es disponibile sub le licentia Creative Commons Attribution-CompartiSimile 3.0 Non localisate.
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Registro de incargamento original

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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representa

exposure time anglese

0.03333333333333333333 secunda

f-number anglese

2,8

focal length anglese

8 millimetro

ISO speed anglese

320

media type anglese

image/jpeg

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Data/HoraMiniaturaDimensionesUsatorCommento
actual14:10, 10 januario 2014Miniatura pro le version de 14:10, 10 januario 2014480 × 552 (232 KB)wikimediacommons>SoerfmLevels, crop

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