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File:EastHanSeismograph.JPG

English: A 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 Centre in Oakland California.
The plaque of the exhibit said:

Detecting a Quake


In 132 CE, after several serious 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.
Français : Réplique d'un ancienne Sismographe (chine orientale, Dynastie des Han (25-220 après JC) ; Photo prise en Juillet 2004, lors d'une exposition au Chabot Space & Science Centre à Oakland en Californie. Selon la légende affichée près de l'oeuvre, :
Sismographe ; En 132 Après JC,, après plusieurs graves tremblements de terre en Chine, l'astronome Zhang Heng a inventé cet instrument pour avertir les gens qu'un séisme était en cours ou en préparation. Quand la terre tremblait, même faiblement, un pendule suspendu au couvercle bougeait à l'intérieur du vase. Le pendule poussait un des levier ouvrant la bouche d'un des dragons. Une bille placée dans la bouche du dragon tombait alors dans celle du crapaud ci-dessous, donnant l'alarme. La seule bouche ouverte dragon donnait la direction du tremblement de terre, qui était notifié à l'empereur

候风地动仪复原模型


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Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer SONY
Camera model CYBERSHOT
Exposure time 1/30 sec (0.033333333333333)
F-number f/2.8
ISO speed rating 320
Date and time of data generation 11:40, 10 July 2004
Lens focal length 8 mm
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
File change date and time 11:40, 10 July 2004
Y and C positioning Co-sited
Exposure Program Normal program
Exif version 2.2
Date and time of digitizing 11:40, 10 July 2004
Exposure bias 0
Maximum land aperture 3 APEX (f/2.83)
Metering mode Pattern
Light source Unknown
Flash Flash did not fire
Colour space sRGB
Custom image processing Normal process
Exposure mode Auto exposure
White balance Auto white balance
Scene capture type Standard

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