Image:EastHanSeismograph.JPG

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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 Center 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.

候风地动仪复原模型

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Date/TimeDimensionsUserComment
current14:33, 25 March 2005480×585 (87 KB)Shizhao (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 Center in Oakland California. The plaque of the exhibit said: <b>Detecting a Quake</b> <br>)
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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
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 2
Exposure Program Normal program
ISO speed rating 320
Exif version 2.2
Date and time of digitizing 11:40, 10 July 2004
Exposure bias 0
Maximum land aperture 3
Metering mode Pattern
Light source Unknown
Flash 0
Color space sRGB
Custom image processing Normal process
Exposure mode Auto exposure
White balance Auto white balance
Scene capture type Standard