Image:EastHanSeismograph.JPG
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EastHanSeismograph.JPG (480 × 585 pixel, file size: 87 KB, MIME type: image/jpeg)
A replica of an ancient Chinese Siesmograph from Eastern Han Dynasty (25-220 CE)
I took this picture 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.
I, the creator of this work, hereby grant the permission 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.
Subject to disclaimers.
File history
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- (del) (cur) 04:08, 12 July 2004 . . Kowloonese (Talk | contribs) . . 480×585 (89,345 bytes) (Ancient Chinese Siesmograph from Eastern Han Dynasty)
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Metadata
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| Camera manufacturer | SONY |
|---|---|
| Camera model | CYBERSHOT |
| Horizontal resolution | 72 dpi |
| Vertical resolution | 72 dpi |
| File change date and time | 11:40, 10 July 2004 |
| Y and C positioning | 2 |
| Exposure time | 1/30 sec (0.033333333333333) |
| F-number | f/2.8 |
| Exposure Program | Normal program |
| ISO speed rating | 320 |
| Exif version | 2.2 |
| Date and time of data generation | 11:40, 10 July 2004 |
| 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 |
| Lens focal length | 8 mm |
| Color space | sRGB |
| Custom image processing | Normal process |
| Exposure mode | Auto exposure |
| White Balance | Auto white balance |
| Scene capture type | Standard |
